This patch set corrects the namespace parameter for capabilities
api-ref from namespace [0] to namespace_1 which is the correct
one as it is both required and matches the following format
in the view code [2]:
The storage namespace, such as
``OS::Storage::Capabilities::foo``.
[0] 7f7716d584/api-ref/source/v3/parameters.yaml (L1945)
[1] 7f7716d584/api-ref/source/v3/parameters.yaml (L1951)
[2] af41c04d0f/cinder/api/views/capabilities.py (L31)
Change-Id: I0557b32e7e3752e8fcde5dadd621c82fded1e755