The configuration version needs to be overridable also

vagrant/release/devstack/Vagrantfile

@@ -68,6 +68,7 @@ openedx_releases.default = "eucalyptus-devstack-2016-09-01"
 
 openedx_release = ENV['OPENEDX_RELEASE']
 
+# Build -e override lines for each overridable variable.
 extra_vars_lines = ""
 VERSION_VARS.each do |var|
   rel = ENV[var.upcase] || openedx_release
@@ -86,7 +87,7 @@ source /edx/app/edx_ansible/venvs/edx_ansible/bin/activate
 cd /edx/app/edx_ansible/edx_ansible/playbooks
 
 EXTRA_VARS="#{extra_vars_lines}"
-CONFIG_VER="#{openedx_release || 'master'}"
+CONFIG_VER="#{ENV['CONFIGURATION_VERSION'] || openedx_release || 'master'}"
 
 ansible-playbook -i localhost, -c local run_role.yml -e role=edx_ansible -e configuration_version=$CONFIG_VER $EXTRA_VARS
 ansible-playbook -i localhost, -c local vagrant-devstack.yml -e configuration_version=$CONFIG_VER $EXTRA_VARS