pin sqlalchemy to the 0.7 series
pin sqlalchemy to the 0.7 series

sqlalchemy 0.8 beta has hit mirrors, and changes dependencies, thus
breaking jenkins. This pins it to 0.7 series until all the projects
agree to move forward to 0.8.

Fixes bug #1073569

Change-Id: If11f39d311ba9ef5cb2b198c9649a8997b2a52b5

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