Address E0102 pylint errors
Address E0102 pylint errors

When pylint is run against manila codebase E0102 errors
are reported in api code, however it is appropriate there
to redefine methods like ``index`` and ``show`` in different
microversion contexts.

Add comments to inform pylint that these redefinitions are
OK.

Change-Id: I295e5b3332ce28811f92487cfafae06568d07871

openstack/manila,openstack/manila