Refactor keystorage and arond.

   * Move key's to soft-param
   * Using link-structure, aka ${linux:XXX:key}
     broke some formulas logic

Closes-Bug: PROD-23577 (PROD:23577)

Change-Id: I81dc528372ec73ac7650f921fc5df76a8ee2027a
diff --git a/linux/system/repo/mcp/apt_mirantis/ubuntu.yml b/linux/system/repo/mcp/apt_mirantis/ubuntu.yml
index 55f6387..0369f7b 100644
--- a/linux/system/repo/mcp/apt_mirantis/ubuntu.yml
+++ b/linux/system/repo/mcp/apt_mirantis/ubuntu.yml
@@ -12,6 +12,7 @@
         ubuntu:
           refresh_db: ${_param:linux_repo_refresh_db}
           source: "deb [arch=amd64] ${_param:linux_system_repo_ubuntu_url} ${_param:linux_system_codename} main restricted universe"
+          key: ${_param:linux_system_repo_ubuntu_key}
           architectures: amd64
           default: true
         ubuntu_updates: