py3: whitelist test-pull-http.t
There's a lot of work left to do on network-related stuff, but I at
least got one more test passing.
Differential Revision: https://phab.mercurial-scm.org/D2296
$ 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