[patch] Use keystoneclient to check project ID

[patch] Use keystoneclient to check project ID

Another prerequisite for decoupling public network from Openstack
internal management network (upstream won't fix it for Pike):
- port fix from [1] for using the internal network when connecting
  to keystone during project ID validation in nova, instead of
  going through public endpoint (and using SSL).

[1] https://bugs.launchpad.net/nova/+bug/1716344

Change-Id: Ic9a307df9af78fcd58cbcc07b5e62a7e07cc8d7d
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>