Now the atop setting are configurable from UI and can be overriden in
hiera. Also, this change adds idempotency and fix noop tests.
DocImpact
Depends-On: Ie0e69f58183193455d5d036b45668a3476f1a693
Change-Id: I59cea9ea5ca31c20db2cf3eaaebe09bad0abdcf8
Closes-Bug: #1597250
Signed-off-by: Maksim Malchuk <mmalchuk@mirantis.com>