Try to terminate new instance if no data could be retrieved

If DescribeInstances did not return any data, send a termination request
for it. If it shows up later, it would be included in capacity
calculations and Jenkins could refuse to instantiate new nodes if the
maximum capacity was reached.

src/main/java/hudson/plugins/ec2/EC2AbstractSlave.java

@@ -162,8 +162,19 @@ public EC2AbstractSlave(String name, String instanceId, String templateDescripti
         this.amiType = amiType;
         this.maxTotalUses = maxTotalUses;
         readResolve();
-        // Wait up to 1 minute for the instance to show up
-        fetchLiveInstanceData(true, 60);
+        try {
+            // Wait up to 1 minute for the instance to show up
+            fetchLiveInstanceData(true, 60);
+        } catch (com.amazonaws.AmazonClientException e) {
+            /*
+             * If DescribeInstances didn't return any information about this
+             * instance, try to terminate it so that if it does come up later
+             * it doesn't affect capacity calculations.
+             */
+            LOGGER.log(Level.WARNING, "Failed to get instance data for new instance " + getInstanceId(), ", terminating");
+            terminateInstance();
+            throw e;
+        }
     }
 
     @Deprecated