Reconfigure updates.mirantis versioning setting

- Use stable updates repo for released jobs
- Add UPDATES_MIRANTIS_VERSION jenkins param
- Add ability to overwrite repo version in context (upgrade
  pre-deployment)
- Set repo version to 'staging' during MCP drivetrain upgrade

Change-Id: I99d70b6802a0215acf8533909f71b7d9f0784621
diff --git a/tcp_tests/templates/released-heat-cicd-pike-contrail41-sl/salt-context-cookiecutter-contrail.yaml b/tcp_tests/templates/released-heat-cicd-pike-contrail41-sl/salt-context-cookiecutter-contrail.yaml
index a8d05b3..207c298 100644
--- a/tcp_tests/templates/released-heat-cicd-pike-contrail41-sl/salt-context-cookiecutter-contrail.yaml
+++ b/tcp_tests/templates/released-heat-cicd-pike-contrail41-sl/salt-context-cookiecutter-contrail.yaml
@@ -319,4 +319,4 @@
   # Enable Mirantis repo with CVE fixes for xenial
   updates_mirantis_login: "%LOGIN%"
   updates_mirantis_password: "%PASS%"
-  updates_mirantis_version: "staging"
\ No newline at end of file
+  updates_mirantis_version: "stable"
\ No newline at end of file