tests/test-mq-qsave.t

phase: rename getphaserevs to loadphaserevs

This function is:
- already loading the data in place,
- used once in the code.

So we drop the return value and change the name to make this obvious. We keep
the function public because we'll have to use it in revset.

  $ 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