Log some context when Intent failed.

Change-Id: Ib30f78f970680144f920ca4754825f78eedb658b
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentInstaller.java b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentInstaller.java
index 3ce320d..d0928ce 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentInstaller.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentInstaller.java
@@ -137,6 +137,9 @@
                 log.debug("Completed withdrawing: {}", uninstallData.key());
                 switch (uninstallData.request()) {
                     case INSTALL_REQ:
+                        // illegal state?
+                        log.warn("{} was requested to withdraw during installation?",
+                                 uninstallData.intent());
                         uninstallData.setState(FAILED);
                         break;
                     case WITHDRAW_REQ:
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Compiling.java b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Compiling.java
index ee62ea3..bb82dfc 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Compiling.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/Compiling.java
@@ -59,7 +59,7 @@
                     stored.map(IntentData::installables).orElse(null));
             return Optional.of(new Installing(processor, new IntentData(data, compiled), stored));
         } catch (IntentException e) {
-            log.debug("Unable to compile intent {} due to: {}", data.intent(), e);
+            log.warn("Unable to compile intent {} due to:", data.intent(), e);
             if (stored.filter(x -> !x.installables().isEmpty()).isPresent()) {
                 // removing orphaned flows and deallocating resources
                 return Optional.of(new Withdrawing(processor, new IntentData(data, stored.get().installables())));
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/phase/WithdrawRequest.java b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/WithdrawRequest.java
index 4062fc62..db7509d 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/phase/WithdrawRequest.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/phase/WithdrawRequest.java
@@ -17,6 +17,8 @@
 
 import org.onosproject.net.intent.IntentData;
 import org.onosproject.net.intent.impl.IntentProcessor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.Optional;
 
@@ -28,6 +30,8 @@
  */
 final class WithdrawRequest implements IntentProcessPhase {
 
+    private static final Logger log = LoggerFactory.getLogger(WithdrawRequest.class);
+
     private final IntentProcessor processor;
     private final IntentData data;
     private final Optional<IntentData> stored;
@@ -57,6 +61,8 @@
         if (!stored.isPresent() || stored.get().installables().isEmpty()) {
             switch (data.request()) {
                 case INSTALL_REQ:
+                    // illegal state?
+                    log.warn("{} was requested to withdraw during installation?", data.intent());
                     return Optional.of(new Failed(data));
                 case WITHDRAW_REQ:
                 default: //TODO "default" case should not happen