Adds option to enable ARA plugin install

Adds the option to enable ARA callback plugin install
during bootstrap-ansible.  Set to false by default in
the bootstrap-ansible script and can be enabled with
the SETUP_ARA variable.  In the gate-check-commit,
installation is set to enabled by default.

Change-Id: I5eb4285100207a8b8808b5000261f70c89c69de2
(cherry picked from commit 8fbd1cbeaa)

scripts/bootstrap-ansible.sh

@@ -27,6 +27,8 @@ export ANSIBLE_PACKAGE=${ANSIBLE_PACKAGE:-"ansible==2.5.10"}
 export ANSIBLE_ROLE_FILE=${ANSIBLE_ROLE_FILE:-"ansible-role-requirements.yml"}
 export SSH_DIR=${SSH_DIR:-"/root/.ssh"}
 export DEBIAN_FRONTEND=${DEBIAN_FRONTEND:-"noninteractive"}
+# check whether to install the ARA callback plugin
+export SETUP_ARA=${SETUP_ARA:-"false"}
 
 # Use pip opts to add options to the pip install command.
 # This can be used to tell it which index to use, etc.
@@ -181,6 +183,11 @@ chmod +x /usr/local/bin/openstack-ansible
 
 echo "openstack-ansible wrapper created."
 
+# Install and export the ARA callback plugin
+if [ "${SETUP_ARA}" == "true" ]; then
+  setup_ara
+fi
+
 # If the Ansible plugins are in the old location remove them.
 [[ -d "/etc/ansible/plugins" ]] && rm -rf "/etc/ansible/plugins"
 

scripts/gate-check-commit.sh

@@ -58,6 +58,9 @@ export INSTALL_METHOD=${3:-"source"}
 # is created. The checkout must always be N-1.
 export UPGRADE_SOURCE_BRANCH=${UPGRADE_SOURCE_BRANCH:-'stable/queens'}
 
+# enable the ARA callback plugin
+export SETUP_ARA=true
+
 ## Change branch for Upgrades ------------------------------------------------
 # If the action is to upgrade, then store the current SHA,
 # checkout the source SHA before executing the greenfield
@@ -102,9 +105,6 @@ fi
 # Bootstrap Ansible
 source "${OSA_CLONE_DIR}/scripts/bootstrap-ansible.sh"
 
-# Install and export the ARA callback plugin
-setup_ara
-
 # Log some data about the instance and the rest of the system
 log_instance_info