rook: add owner reference to the discover daemon
rook: add owner reference to the discover daemon

Attach owner reference to the discover daemon set so that when the
opetator goes away, the discover pod gets removed too.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

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