add selector for isgw service
add selector for isgw service

Signed-off-by: Dmitry Yusupov <b4f1755a65985c6fdd1fe3681b5a7b75d78c90aa@nexenta.com>

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