tests/test-issue436.t

run-tests: use regex when searching for $HGPORT in test output

This prevents spurious errors when a changeset hash happens to match
the port number. Before, this invocation gave a test failure:

  $ ./run-tests.py test-log.t --port 24427
  ERROR: /home/mg/src/mercurial-crew/tests/test-log.t output changed
  --- /home/mg/src/mercurial-crew/tests/test-log.t
  +++ /home/mg/src/mercurial-crew/tests/test-log.t.err
  @@ -626,12 +626,12 @@

     $ hg log -b default
     changeset:   2:c3a4f03cc9a7
  -  parent:      0:24427303d56f
  +  parent:      0:$HGPORT303d56f
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commit on default

  ...

http://mercurial.selenic.com/bts/issue436

  $ hg init
  $ hg -v log -v
  $ hg -v log -v x