Remove unsed python modules from requirements
Remove unsed python modules from requirements

The following modules are no longer directly used in Manila's codebase
so remove theses modules:

 * argparse
 * kombu
 * lockfile
 * posix_ipc
 * suds
 * wsgiref

Change-Id: I34619507268d0444d4b2c08d5f68ee7216eb5a49

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