Ceph: Add design for managed poddisrupionbudgets.
Ceph: Add design for managed poddisrupionbudgets.

This design proposes that rook creates and manages PDBs for all ceph
daemons. OSDs need special treatment and a new heuristic, but simple
PDBs will suffice for other daemon types.

Signed-off-by: Rohan CJ <bafb82cb27ab075a63bf69c464cfc523b04e4081@gmail.com>

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