Comment 4 for bug 1351223

Verification on R1.1 #27 :
 The Vn which is shared is not allowed to be unshared if any instance is using it in a diff project.
Only when the instance is terminated ,it allows to change to sharing property .
root@nodea5:~# neutron net-update vn-shared --shared=false
409-{u'NeutronError': {u'message': u'Unable to reconfigure sharing settings for network vn-shared. Multiple tenants are using it', u'type': u'ContrailConflictError', u'detail': u''}}
root@nodea5:~#