Convert lvm_mirrors to int
Convert lvm_mirrors to int

When the location_info is parsed and `lvm_mirrors` extracted, it is not
being converted to int. This causes some boolean checks to return True
even when there are not mirrors enabled because of the u'0'.

Closes-bug: #1258133
Change-Id: I67c463d9f139fe326bbcab4d193c45459129b514

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