Change apt_mk_version => mcp_version

   * Alligh all variables to one
   * Due mcp_version: ${_param:apt_mk_version}
     those change still bw compatible

Bug-relateted: PROD-24789 (PROD:24789)
Change-Id: I30b6fb0b1cb66c7d56dbb3a5e15c8bc9606405b5
diff --git a/linux/system/repo_local/mcp/ceph.yml b/linux/system/repo_local/mcp/ceph.yml
index 89308ad..31b60ba 100644
--- a/linux/system/repo_local/mcp/ceph.yml
+++ b/linux/system/repo_local/mcp/ceph.yml
@@ -4,6 +4,6 @@
       repo:
         ceph:
           refresh_db: ${_param:linux_repo_refresh_db}
-          source: "deb [arch=amd64] http://${_param:local_repo_url}/ubuntu-${_param:linux_system_codename}/ ${_param:apt_mk_version} ceph"
+          source: "deb [arch=amd64] http://${_param:local_repo_url}/ubuntu-${_param:linux_system_codename}/ ${_param:mcp_version} ceph"
           architectures: amd64
           key_url: "http://${_param:local_repo_url}/public.gpg"