Override cache and identity params in Panko reclass

There is need to override cache, identity, database parameters on
system level of Panko reclass, to have ability to run Panko inside
separate cluster.

Change-Id: I7dfedc1c3cb7c83d87951c6ea28f3b859cb622e1
Depends-On: I2d43b8ab99a3f465d76f81970cb5092d358e9a39
Related-Prod: https://mirantis.jira.com/browse/PROD-17192
1 file changed