Temp workaround: drop volumes from tests
Temp workaround: drop volumes from tests

for some time disabling volumes from tests until
root case of issue is found and fixed. please revert
this change right after that fixed.

Related bug: 1636759

Change-Id: I1eda01c14c230380cc075dda03b4c233f74c7336

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