Alternative way to import emc.plugins.registry
Alternative way to import emc.plugins.registry

Alternative way to import emc.plugins.registry and fix the related pep8 issues.

Change-Id: Idd0e8cbb7ecdaf2e57017863b57f699710db7082

NetApp/manila,openstack/manila,jcsp/manila,bswartz/manila,redhat-openstack/manila,weiting-chen/manila,weiting-chen/manila,scality/manila,redhat-openstack/manila,bswartz/manila,NetApp/manila,sajuptpm/manila,openstack/manila,scality/manila,sajuptpm/manila,jcsp/manila,vponomaryov/manila,vponomaryov/manila