Move 'linux_system_repo_*_url' to defaults

  * For mirror.mirantis.com only

Change-Id: Ia5a139bdf3fc1321e60f61e62eb4fd62a096bcfd
Related-Bug: PROD-23771 (PROD:23771)
diff --git a/linux/system/repo/mcp/apt_mirantis/saltstack.yml b/linux/system/repo/mcp/apt_mirantis/saltstack.yml
index 7e18c2e..2d4dd2c 100644
--- a/linux/system/repo/mcp/apt_mirantis/saltstack.yml
+++ b/linux/system/repo/mcp/apt_mirantis/saltstack.yml
@@ -1,17 +1,13 @@
 classes:
 - system.linux.system.repo.keystorage.saltstack
 parameters:
-  _param:
-    salt_version: 2017.7
-    linux_system_repo_url: http://mirror.mirantis.com/${_param:apt_mk_version}/
-    linux_system_repo_mcp_saltstack_url: ${_param:linux_system_repo_url}/saltstack-${_param:salt_version}/
   linux:
     system:
       repo:
         mcp_saltstack:
           source: "deb [arch=amd64] ${_param:linux_system_repo_mcp_saltstack_url}/${_param:linux_system_codename}/ ${_param:linux_system_codename} main"
           key: ${_param:linux_system_repo_mcp_saltstack_key}
-          architectures: amd64
+          architectures: ${_param:linux_system_architecture}
           clean_file: true
           pinning:
             10: