Fix Mapr on ci
Fix Mapr on ci

1. Flavor for Mapr master is small and CLDB
cannot start. Need large flavor.
2. Add testing the use of ephemeral drive.
3. Disable check of EDP on Mapr, because of scenario tests
cannot write to MaprFS

Change-Id: I44537773517bf98fc83a54947efe02663212eb2d

openstack/sahara-scenario,esikachev/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,esikachev/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-tests