Implement IntentInstallers

IntentInstallers for:
- PathFlowIntent
- SingleDstTreeFlowIntent
- SingleSrcTreeFlowIntent

This resolves ONOS-1884, ONOS-1885, and ONOS-1886.

Change-Id: Ie0eac4bab9a2898b582edf2e4291498f0a583d71
diff --git a/src/main/java/net/onrc/onos/core/newintent/IntentInstallationException.java b/src/main/java/net/onrc/onos/core/newintent/IntentInstallationException.java
new file mode 100644
index 0000000..4dca400
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/newintent/IntentInstallationException.java
@@ -0,0 +1,22 @@
+package net.onrc.onos.core.newintent;
+
+import net.onrc.onos.api.newintent.IntentException;
+
+/**
+ * An exception thrown when intent installation fails.
+ */
+public class IntentInstallationException extends IntentException {
+    private static final long serialVersionUID = 3720268258616014168L;
+
+    public IntentInstallationException() {
+        super();
+    }
+
+    public IntentInstallationException(String message) {
+        super(message);
+    }
+
+    public IntentInstallationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}