[hybrid] Merge config/scenario/{baremetal,virtual}

[hybrid] Merge config/scenario/{baremetal,virtual}

Instead of classifying scenarios by underlying machine type, switch
to HA/NOHA differentiantion only.

This allows us to add support for hybrid scenarios (with some virtual
and some baremetal nodes in the same cluster).

To facilitate this, we will template the scenario files, which is a
small step towards SDF (Scenario Descriptor File) definition and
adoption later.

JIRA: FUEL-338

Change-Id: If5787991869a3105d82c27ffa0a86ac79b4b08ba
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>