Fix bug CS-15261.

In case IP address is passed to deployVirtualMachine API, the default property on NIC was not getting set and as a result there was a failure down the line and VM creation was failing.

server/src/com/cloud/vm/UserVmManagerImpl.java

@@ -2351,11 +2351,12 @@ public class UserVmManagerImpl implements UserVmManager, UserVmService, Manager
             
             if (defaultNetworkNumber == 0) {
             	 defaultNetworkNumber++;
-            	 profile.setDefaultNic(true);
                  // if user requested specific ip for default network, add it
                  if (defaultNetworkIp != null) {
                      profile = new NicProfile(defaultNetworkIp);
                  }
+                 
+                 profile.setDefaultNic(true);
             }
 
             networks.add(new Pair<NetworkVO, NicProfile>(network, profile));