Add kwargs to create_volume in tests/utils.py
Add kwargs to create_volume in tests/utils.py

Add availability_zone parameter and kwargs to make create_volume
function more flexible in order to use this function in
unit tests.
The goal is to remove inner _create_volume function in:
- db/test_transfers.py
- api/contrib/test_backups.py
- test_gpfs.py
- test_volume_transfer.py
- test_volume.py
and to use create_volume from tests/utils instead.

Change-Id: I2d9456ff3ff1cd945042f19c47e40f9f0ec0fe8a

sasukeh/cinder,potsmaster/cinder,nexusriot/cinder,winndows/cinder,j-griffith/cinder,blueboxgroup/cinder,rakeshmi/cinder,potsmaster/cinder,mahak/cinder,github-borat/cinder,eharney/cinder,openstack/cinder,rakeshmi/cinder,dims/cinder,tlakshman26/cinder-https-changes,alex8866/cinder,tlakshman26/cinder-https-changes,Datera/cinder,NetApp/cinder,sasukeh/cinder,nikesh-mahalka/cinder,blueboxgroup/cinder,scottdangelo/RemoveVolumeMangerLocks,abusse/cinder,scality/cinder,tlakshman26/cinder-new-branch,CloudServer/cinder,cloudbase/cinder,Accelerite/cinder,manojhirway/ExistingImagesOnNFS,cloudbau/cinder,leilihh/cinder,bswartz/cinder,mahak/cinder,redhat-openstack/cinder,nikesh-mahalka/cinder,github-borat/cinder,scottdangelo/RemoveVolumeMangerLocks,redhat-openstack/cinder,Hybrid-Cloud/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,Paul-Ezell/cinder-1,takeshineshiro/cinder,NetApp/cinder,nexusriot/cinder,bswartz/cinder,takeshineshiro/cinder,JioCloud/cinder,Akrog/cinder,eharney/cinder,Akrog/cinder,Hybrid-Cloud/cinder,cloudbase/cinder,duhzecca/cinder,phenoxim/cinder,tlakshman26/cinder-new-branch,spring-week-topos/cinder-week,Nexenta/cinder,spring-week-topos/cinder-week,Accelerite/cinder,manojhirway/ExistingImagesOnNFS,JioCloud/cinder,ge0rgi/cinder,ntt-sic/cinder,Thingee/cinder,ntt-sic/cinder,Nexenta/cinder,phenoxim/cinder,Paul-Ezell/cinder-1,julianwang/cinder,petrutlucian94/cinder,abusse/cinder,NeCTAR-RC/cinder,NeCTAR-RC/cinder,openstack/cinder,j-griffith/cinder,Thingee/cinder,cloudbau/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,hguemar/cinder,julianwang/cinder,Thingee/cinder,winndows/cinder,apporc/cinder,alex8866/cinder,scality/cinder,rickerc/cinder_audit,saeki-masaki/cinder,saeki-masaki/cinder,rickerc/cinder_audit,apporc/cinder,hguemar/cinder,petrutlucian94/cinder,CloudServer/cinder,Datera/cinder,leilihh/cinder,duhzecca/cinder,dims/cinder