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-bm-mcp-ocata-contrail/salt-context-cookiecutter-contrail-dpdk.yaml b/tcp_tests/templates/cookied-bm-mcp-ocata-contrail/salt-context-cookiecutter-contrail-dpdk.yaml
index 769ded7..80f389e 100644
--- a/tcp_tests/templates/cookied-bm-mcp-ocata-contrail/salt-context-cookiecutter-contrail-dpdk.yaml
+++ b/tcp_tests/templates/cookied-bm-mcp-ocata-contrail/salt-context-cookiecutter-contrail-dpdk.yaml
@@ -1,4 +1,5 @@
 default_context:

+  mcp_version: testing
   cicd_enabled: 'False'

   cluster_domain: cookied-bm-mcp-ocata-contrail.local

   cluster_name: deployment_name