Fix find_autodoc_modules.sh to support OSX
Fix find_autodoc_modules.sh to support OSX

When running 'find cinder/' on OSX platforms, all returned paths
will have 2 slashes (//). Because the script only strips
the first slash as per the CINDER_DIR value, we end up
with module names such as "cinder..db.api" in the documentation.

This change trims the leading dot if found to avoid this situation.

Change-Id: I9423b253d9842295850f469757e928bf5856967a

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