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/keystorage/percona.yml b/linux/system/repo/keystorage/percona.yml
index 809f3cb..8b935e2 100644
--- a/linux/system/repo/keystorage/percona.yml
+++ b/linux/system/repo/keystorage/percona.yml
@@ -1,86 +1,82 @@
 parameters:
-  linux:
-    system:
-      repo:
-        mcp_percona:
-          # Percona Development Team (Packaging key) <info@percona.com>
-          # pub   4096R/8507EFA5 2016-06-30
-          key: |
-            -----BEGIN PGP PUBLIC KEY BLOCK-----
-            Version: GnuPG v1
+  _param:
+    # Percona Development Team (Packaging key) <info@percona.com>
+    # pub   4096R/8507EFA5 2016-06-30
+    linux_system_repo_mcp_percona_key: |-
+        -----BEGIN PGP PUBLIC KEY BLOCK-----
+        Version: GnuPG v1
 
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