Revert "osd: add 'osd blacklist' cap for osp keyrings"

Revert "osd: add 'osd blacklist' cap for osp keyrings"

This reverts commit 2d955757ee9324a018374f628664e2e15dcb7903.

The "osd blacklist" isn't an osd caps but should be used with mon caps.
Also the correct caps for this is: 'allow command "osd blacklist"'.
The current change is breaking the openstack and clients keyrings.
By using the profile rbd (which is already used) we already rely on the
ability to blacklist dead client.

Resolves: #4385

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>
(cherry picked from commit 717af83475e4ece252b4a776dcd17b013451a075)