Add 'current-release' and 'previous-release' variables to JJB

Change-Id: If6cb2bfa6a7102413188ba81d87a7575f741271d
Related-Prod: PROD-34955
diff --git a/jobs/templates/released-bm-pike-ovs.yml b/jobs/templates/released-bm-pike-ovs.yml
index dbb8f1d..feab620 100644
--- a/jobs/templates/released-bm-pike-ovs.yml
+++ b/jobs/templates/released-bm-pike-ovs.yml
@@ -33,7 +33,7 @@
         name: PLATFORM_STACK_INSTALL_TIMEOUT
         trim: 'false'
     - string:
-        default: 2019.2.0
+        default: "{previous-version}"
         description: ''
         name: MCP_VERSION
         trim: 'false'
@@ -63,30 +63,30 @@
         name: ENV_NAME
         trim: 'false'
     - string:
-        default: refs/heads/2019.2.0
+        default: refs/tags/{previous-version}
         description: |-
           Example: refs/changes/89/411189/36
           (for now - only one reference allowed)
         name: TCP_QA_REFS
         trim: 'false'
     - string:
-        default: refs/heads/release/2019.2.0
+        default: refs/tags/{previous-version}
         description: reference to patchset in pipeline-library
         name: PIPELINE_LIBRARY_REF
         trim: 'false'
     - string:
-        default: refs/heads/release/2019.2.0
+        default: refs/tags/{previous-version}
         description: reference to patchset in mk-pipelines
         name: MK_PIPELINES_REF
         trim: 'false'
     - string:
-        default: 2019.2.0
+        default: refs/tags/{previous-version}
         description: Can be 'master' or 'proposed'. If empty, then takes ${{MCP_VERSION}}
           value
         name: COOKIECUTTER_TEMPLATE_COMMIT
         trim: 'false'
     - string:
-        default: 2019.2.0
+        default: refs/tags/{previous-version}
         description: Can be 'master' or 'proposed'. If empty, then takes ${{MCP_VERSION}}
           value
         name: SALT_MODELS_SYSTEM_COMMIT
@@ -108,7 +108,7 @@
         name: COOKIECUTTER_REF_CHANGE
         trim: 'false'
     - string:
-        default: refs/heads/2019.2.0
+        default: refs/tags/{previous-version}
         description: ''
         name: ENVIRONMENT_TEMPLATE_REF_CHANGE
         trim: 'false'
@@ -161,12 +161,12 @@
         name: LAB_PARAM_DEFAULTS
         trim: 'false'
     - string:
-        default: refs/heads/release/2019.2.0
+        default: refs/tags/{previous-version}
         description: ''
         name: JENKINS_PIPELINE_BRANCH
         trim: 'false'
     - string:
-        default: refs/heads/release/2019.2.0
+        default: refs/tags/{previous-version}
         description: ''
         name: MCP_COMMON_SCRIPTS_REFS
         trim: 'false'