Async netconf API + command for netconf troubleshooting

- Added async API for fetching entire config (+ state)
- netconf-get
   issue netcong rpc get
- netconf-get-config
   Revised to use async API to deal with slow device

Example usage:
  onos> netconf-get netconf:192.168.56.1:2022 | ppxml

 for ONOS-7481

Change-Id: Id012e984275109c93bdae113f3fec685a7b2211b
diff --git a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetCommand.java
similarity index 65%
copy from protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java
copy to protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetCommand.java
index bac6bef..2d29fcd 100644
--- a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java
+++ b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetCommand.java
@@ -16,10 +16,13 @@
 package org.onosproject.netconf.cli.impl;
 
 import static com.google.common.base.Preconditions.checkNotNull;
-import static org.onosproject.netconf.DatastoreId.datastore;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
 
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.net.DeviceId;
 import org.onosproject.netconf.NetconfController;
@@ -28,29 +31,26 @@
 import org.onosproject.netconf.NetconfSession;
 
 /**
- * Command that gets the configuration of the specified type from the specified
- * device. If configuration cannot be retrieved it prints an error string.
+ * Command that retrieves running configuration and device state.
+ * If configuration cannot be retrieved it prints an error string.
  */
-@Command(scope = "onos", name = "netconf-get-config",
-        description = "Gets the configuration of the specified type from the" +
-                "specified device.")
-public class NetconfConfigGetCommand extends AbstractShellCommand {
+@Command(scope = "onos", name = "netconf-get",
+        description = "Retrieve running configuration and "
+                + "device state information from specified device.")
+public class NetconfGetCommand extends AbstractShellCommand {
 
-    @Argument(index = 0, name = "uri", description = "Device ID",
+    @Argument(index = 0, name = "deviceId", description = "Device ID",
             required = true, multiValued = false)
     String uri = null;
 
-    @Argument(index = 1, name = "cfgType",
-              description = "Configuration datastore name (running, etc.)",
-              required = true, multiValued = false)
-    String cfgType = null;
-
-
-    private DeviceId deviceId;
+    @Option(name = "--timeout",
+            description = "Timeout in seconds",
+            required = false)
+    long timeoutSec = 30;
 
     @Override
     protected void execute() {
-        deviceId = DeviceId.deviceId(uri);
+        DeviceId deviceId = DeviceId.deviceId(uri);
 
         NetconfController controller = get(NetconfController.class);
         checkNotNull(controller, "Netconf controller is null");
@@ -68,9 +68,10 @@
         }
 
         try {
-            String res = session.getConfig(datastore(cfgType.toLowerCase()));
+            CharSequence res = session.asyncGet()
+                    .get(timeoutSec, TimeUnit.SECONDS);
             print("%s", res);
-        } catch (NetconfException e) {
+        } catch (NetconfException | InterruptedException | ExecutionException | TimeoutException e) {
             log.error("Configuration could not be retrieved", e);
             print("Error occurred retrieving configuration");
         }
diff --git a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetConfigCommand.java
similarity index 74%
rename from protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java
rename to protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetConfigCommand.java
index bac6bef..2aedaa9 100644
--- a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfConfigGetCommand.java
+++ b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/cli/impl/NetconfGetConfigCommand.java
@@ -18,8 +18,13 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onosproject.netconf.DatastoreId.datastore;
 
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.net.DeviceId;
 import org.onosproject.netconf.NetconfController;
@@ -34,17 +39,21 @@
 @Command(scope = "onos", name = "netconf-get-config",
         description = "Gets the configuration of the specified type from the" +
                 "specified device.")
-public class NetconfConfigGetCommand extends AbstractShellCommand {
+public class NetconfGetConfigCommand extends AbstractShellCommand {
 
-    @Argument(index = 0, name = "uri", description = "Device ID",
+    @Argument(index = 0, name = "deviceId", description = "Device ID",
             required = true, multiValued = false)
     String uri = null;
 
-    @Argument(index = 1, name = "cfgType",
+    @Argument(index = 1, name = "datastore",
               description = "Configuration datastore name (running, etc.)",
-              required = true, multiValued = false)
-    String cfgType = null;
+              required = false, multiValued = false)
+    String datastore = "running";
 
+    @Option(name = "--timeout",
+            description = "Timeout in seconds",
+            required = false)
+    long timeoutSec = 30;
 
     private DeviceId deviceId;
 
@@ -68,9 +77,10 @@
         }
 
         try {
-            String res = session.getConfig(datastore(cfgType.toLowerCase()));
+            CharSequence res = session.asyncGetConfig(datastore(datastore.toLowerCase()))
+                                .get(timeoutSec, TimeUnit.SECONDS);
             print("%s", res);
-        } catch (NetconfException e) {
+        } catch (NetconfException | InterruptedException | ExecutionException | TimeoutException e) {
             log.error("Configuration could not be retrieved", e);
             print("Error occurred retrieving configuration");
         }