Create a new python-novaclient-core group
Create a new python-novaclient-core group

This group should inherit members from nova-core, but allows me to add
reviewers who are only core on python-novaclient. If you want a simple
population for the initial members, just add me and I will fix the rest
up.

Change-Id: I5b31a3b91da878d95d80154acb6dc4908fb9046d

open-switch/infra_project-config,coolsvap/project-config,Tesora/tesora-project-config,noorul/os-project-config,noorul/os-project-config,coolsvap/project-config,citrix-openstack/project-config,dongwenjuan/project-config,open-switch/infra_project-config,openstack-infra/project-config,anbangr/osci-project-config,openstack-infra/project-config,anbangr/osci-project-config,Tesora/tesora-project-config,citrix-openstack/project-config,dongwenjuan/project-config