CIMI - Test - systems scenario test

Signed-off-by: marios <marios@redhat.com>
CIMI: CIMI Systems - tidy up way that Action resources are performed

Signed-off-by: marios <marios@redhat.com>
CIMI: CIMI Systems - convert returned Model::System to Service::System & typo on SystemCreate

(CIMI::Service::SystemCreate was not using resolved template)
CIMI: CIMI Systems mock driver - many fixes - create/start/stop/delete system
CIMI: CIMI Systems mock driver fixtures (json)
CIMI: CIMI Systems - fixes in collection/base classes to correctly set 'href' for system collections

(otherwise to_xml explodes)
CIMI: CIMI (white box) Tests - fixes for start/stop/delete system (+machines)

Adds rake task for pf2 (rake test:cimiplan_pf2) and skips if no systems