define openstack-base from kolla_sources

Author: seunghun1ee

etc/kayobe/kolla.yml

@@ -143,6 +143,10 @@ kolla_sources:
     type: git
     location: https://github.com/stackhpc/networking-generic-switch.git
     reference: stackhpc/{{ openstack_release }}
+  openstack-base:
+    type: git
+    location: https://github.com/stackhpc/requirements.git
+    reference: stackhpc/{{ openstack_release }}
 
 ###############################################################################
 # Kolla image build configuration.