Correct the error message in the Class NoNetworkAvailable
Correct the error message in the Class NoNetworkAvailable

Bug #1052294

Change "No virtual network is available." to "No tenant
network is available for allocation."

Change-Id: I8e2b40df1afa46522666d51218b82a4deef2ff64

gkotton/vmware-nsx,gkotton/vmware-nsx