Add run_gate.sh script for CI
Add run_gate.sh script for CI

Use single unified gate script will be helpful to works after the jobs
is done.

Change-Id: Ic0bbeef4b431132b4f992a696dc5e83c43821b91
Closes-Bug: #1647379

coolsvap/kolla,openstack/kolla,stackforge/kolla,nihilifer/kolla,nihilifer/kolla,rahulunair/kolla,mrangana/kolla,rahulunair/kolla,stackforge/kolla,mrangana/kolla,GalenMa/kolla,coolsvap/kolla,openstack/kolla,coolsvap/kolla,intel-onp/kolla,GalenMa/kolla,stackforge/kolla,intel-onp/kolla