Allow the option to specify OSA git repo URL

Given the leapfrog branches are all EOL and frozen, an operator
may need to make changes to branches on a local repo in order to combat
bit rot over time.

Change-Id: Ia8214a273b38418808b063b0192bbf81bf455daf

leap-upgrades/lib/functions.sh

@@ -415,7 +415,7 @@ function run_items {
 function clone_release {
     # If the git directory is not present clone the source into place at the given directory
     if [[ ! -d "/opt/leap42/openstack-ansible-base/.git" ]]; then
-      git clone https://git.openstack.org/openstack/openstack-ansible "/opt/leap42/openstack-ansible-base"
+      git clone ${OSA_REPO_URL} "/opt/leap42/openstack-ansible-base"
     fi
 
     # The clone release function clones everything from upstream into the leap42 directory as needed.

leap-upgrades/lib/vars.sh

@@ -19,6 +19,7 @@ export DEBUG="${DEBUG:-TRUE}"
 export DEBUG_PATH="${DEBUG_PATH:-/tmp/run_debug}"
 
 ## Script Vars ---------------------------------------------------------------
+export OSA_REPO_URL="${OSA_REPO_URL:-https://git.openstack.org/openstack/openstack-ansible}"
 export JUNO_RELEASE="${JUNO_RELEASE:-eol-juno}"
 export KILO_RELEASE="${KILO_RELEASE:-11.2.17}"  # eol-kilo has swift in upper-constraints, preventing venv building
 export LIBERTY_RELEASE="${LIBERTY_RELEASE:-liberty-eol}"