objectstore: Add ceph group as FsGroup
objectstore: Add ceph group as FsGroup

ceph gid (167) provided as supplymentary group, so that all the mounts can
be accessed by the same. This is required for ssl certificate consumed by
the rgw server from ceph octopus onwards.

Closes: https://github.com/rook/rook/issues/5265
Signed-off-by: Jiffin Tony Thottan <ac134a614b50f2e879db85acb9f4b45b24a210dc@gmail.com>

rook/rook,rook/nfs,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook