tests/test-merge-subrepos.t

tests: increase test-https malform error glob

The recently introduced (ecc9b788fd690a0a) test around malformed pem files hard
codes an error message which doesn't appear to be cross platform agnostic. On
our machines (centos6 if it matters) the test output differs:

-  abort: error: unknown error* (glob)
+  abort: error: _ssl.c:330: error:00000000:lib(0):func(0):reason(0)

This patch increases the glob to cover the entire error message.

  $ hg init

  $ echo a > a
  $ hg ci -qAm 'add a'

  $ hg init subrepo
  $ echo 'subrepo = http://example.net/libfoo' > .hgsub
  $ hg ci -qAm 'added subrepo'

  $ hg up -qC 0
  $ echo ax > a
  $ hg ci -m 'changed a'
  created new head

  $ hg up -qC 1
  $ cd subrepo
  $ echo b > b
  $ hg add b
  $ cd ..

Should fail, since there are added files to subrepo:

  $ hg merge
  abort: uncommitted changes in subrepository 'subrepo'
  [255]