remotefilelog: drop compat code for "getbundle_shallow" wireprotocol command
Doing some annotate on hgexperimental shows that getbundle_shallow used to exist
in 2013 or before. We don't have any pre-2013 remotefilelog users except Fb
themselves and I doubt they are going to use in-core remotefilelog. So it's safe
to remove this.
Differential Revision: https://phab.mercurial-scm.org/D5193
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state