Use mcp_version for cookiecutter-templates models

Previously used 'apt_mk_version' variable is now depends on
'mcp_version' cookiecutter parameter.

Without mcp_version, 'jenkins_pipelines_branch' was set to master,
and maybe some other components also was set to some defaults.

Change-Id: Idb2a2580038fbeebda6b356950d0085021a779f3
diff --git a/tcp_tests/templates/cookied-mcp-ocata-dop-sl2/salt-context-cookiecutter-cicd_oss.yaml b/tcp_tests/templates/cookied-mcp-ocata-dop-sl2/salt-context-cookiecutter-cicd_oss.yaml
index 3368698..a5006d4 100644
--- a/tcp_tests/templates/cookied-mcp-ocata-dop-sl2/salt-context-cookiecutter-cicd_oss.yaml
+++ b/tcp_tests/templates/cookied-mcp-ocata-dop-sl2/salt-context-cookiecutter-cicd_oss.yaml
@@ -1,4 +1,5 @@
 default_context:
+  mcp_version: testing
   cicd_control_node01_address: 10.167.4.91
   cicd_control_node01_hostname: cid01
   cicd_control_node02_address: 10.167.4.92