CS-15173: Additional Cluster is allowed to add with the same VSM IPaddress as the previous cluster

reviewed-by: Sateesh
Description:

	Missed deletion of cluster record in case of failure in
	validation of vsm:cluster mapping restriction.

Author: Vijayendra Bhamidipati

server/src/com/cloud/resource/ResourceManagerImpl.java

@@ -461,6 +461,7 @@ public List<? extends Cluster> discoverCluster(AddClusterCmd cmd) throws Illegal
 	            	List<ClusterVSMMapVO> clusterList = _clusterVSMDao.listByVSMId(vsm.getId());
 	            	if (clusterList != null && !clusterList.isEmpty()) {	            
 	            		s_logger.error("Failed to add cluster: specified Nexus VSM is already associated with another cluster");
+	            		_clusterDao.remove(clusterId);
 	            		ResourceInUseException ex = new ResourceInUseException("Failed to add cluster: specified Nexus VSM is already associated with another cluster with specified Id");
 	            		ex.addProxyObject("cluster", clusterList.get(0).getClusterId(), "clusterId");
 	            		throw ex;