appview,knotmirror: use knotmirror to read the repository
Underlying types except the interface hasn't changed much.
Removed `xrpcclient.HandleXrpcErr()` call as appview always expect
knotmirror with compatible API.
Signed-off-by: Seongmin Lee <git@boltless.me>
authored by
boltless.me
and committed by
tangled.org
35ceae65
72c1b45b