Add gitlab CI for automated testing

Signed-off-by: Jose Castro Leon <jose.castro.leon@cern.ch>

.gitlab-ci.yml

+---
+variables:
+  OPENSTACK_VERSION: 'yoga'
+  DISTGIT_BRANCH: 'yoga-rdo'
+  BUILD_9al: 'True'
+  BUILD_9el: 'True'
+
+include:
+- project: 'cloud-infrastructure/cci-gitlab-ci-helpers'
+  file: 'osproject.yml'
+  ref: master