Drop duplicate sqlalchemy db api methods
Drop duplicate sqlalchemy db api methods

Several methods were redefined at the bottom of
cinder/db/sqlalchemy/api.py. They have been removed:
- quota_get
- quota_get_all_by_project
- quota_create
- quota_update
- quota_destroy
- quota_destroy_all_by_project
- quota_class_get
- quota_class_get_all_by_name
- quota_class_create
- quota_class_update
- quota_class_destroy
- quota_class_destroy_all_by_name
- quota_usage_get
- quota_usage_get_all_by_project
- quota_usage_create
- quota_usage_update
- quota_usage_destroy

Fix bug 1070033

Change-Id: I64b0b0045af7251853da97a8a8c4b2cb09b1dd53

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