VPC: don't generate empty SetStaticRoute command during VR start when there are no static routes for the VPC

Conflicts:

	server/src/com/cloud/user/AccountManagerImpl.java

server/src/com/cloud/network/router/VpcVirtualNetworkApplianceManagerImpl.java

@@ -810,7 +810,9 @@ public class VpcVirtualNetworkApplianceManagerImpl extends VirtualNetworkApplian
         
         s_logger.debug("Found " + staticRouteProfiles.size() + " static routes to apply as a part of vpc route " 
                 + router + " start");
+        if (!staticRouteProfiles.isEmpty()) {   
             createStaticRouteCommands(staticRouteProfiles, router, cmds);
+        }
         
         //4) REPROGRAM GUEST NETWORK
         boolean reprogramGuestNtwks = true;