sap_ha_pacemaker_cluster: Variable separation for rhel and sles

[marcelmamula]

Current setup with sap_ha_pacemaker_cluster role is using lot of Redhat variables which are not existing in SUSE.
I am planning to separate them from platform and scenario var files into their respective platform files.

@sean-freeman Let me know if you agree with this and I will proceed.

Issue example:
hana_scaleout_common.yml:

__sap_ha_pacemaker_cluster_sap_extra_packages:
  - resource-agents-sap-hana-scaleout

SUSE has only combined package with 'resource-agents'

This could be resolved by removing listed vars from their vars and moving them to suse/redhat vars:

• __sap_ha_pacemaker_cluster_sap_extra_packages
• sap_ha_pacemaker_cluster_fence_agent_packages
• __sap_ha_pacemaker_cluster_repos

[marcelmamula]

Change contained in PR #642