Yoga: stop using StackHPC Bifrost fork

We are not carrying any patches in Yoga.

Author: markgoddard

etc/kayobe/kolla.yml

@@ -111,10 +111,6 @@ kolla_openstack_release: TODO
 #     location: https://github.com/openstack/ironic
 #     reference: master
 kolla_sources:
-  bifrost-base:
-    type: git
-    location: "{{ kolla_bifrost_source_url }}"
-    reference: "{{ kolla_bifrost_source_version }}"
   cloudkitty-base:
     type: git
     location: https://github.com/stackhpc/cloudkitty.git

etc/kayobe/stackhpc.yml

@@ -106,10 +106,6 @@ stackhpc_repo_treasuredata_4_version: "{{ stackhpc_repo_distribution }}"
 ###############################################################################
 # Sources
 
-# Bifrost source repository.
-stackhpc_bifrost_source_url: "https://github.com/stackhpc/bifrost"
-stackhpc_bifrost_source_version: "stackhpc/{{ openstack_release }}"
-
 # Kolla source repository.
 stackhpc_kolla_source_url: "https://github.com/stackhpc/kolla"
 stackhpc_kolla_source_version: "stackhpc/{{ openstack_release }}"