autolanding silently fails if changelog is badly formatted

[Martin Mrazik]

autoland.py fails with no trace in the merge proposal. In the followin case the changelog is missing one space after the e-mail address. CI and the previous autolanding tests are passing just fine.

DEBUG: Merging lp:~music-app-dev/music-app/frankenstein-merge to lp:music-app
Traceback (most recent call last):
  File "/var/lib/jenkins/jenkins-launchpad-plugin/autoland.py", line 272, in <module>
    sys.exit(main())
  File "/var/lib/jenkins/jenkins-launchpad-plugin/autoland.py", line 263, in main
    return merge_and_commit(launchpad, mp, args)
  File "/var/lib/jenkins/jenkins-launchpad-plugin/autoland.py", line 105, in merge_and_commit
    target.merge(source, str(mp.reviewed_revid))
  File "/usr/local/lib/python2.7/dist-packages/tarmac/branch.py", line 108, in merge
    branch.bzr_branch, to_revision=revid)
  File "<string>", line 4, in merge_from_branch_write_locked
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree.py", line 806, in merge_from_branch
    conflicts = merger.do_merge()
  File "/usr/lib/python2.7/dist-packages/bzrlib/merge.py", line 686, in do_merge
    merge = operation.run_simple()
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/merge.py", line 653, in _do_merge_to
    hook(merge)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/__init__.py", line 205, in pre_merge
    pre_merge_fix_ancestry(merger)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/__init__.py", line 315, in pre_merge_fix_ancestry
    source_revid=merger.other_tree.get_revision_id())
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/merge_package.py", line 119, in fix_ancestry_as_needed
    (us_ver, us_revid) = _upstream_version_data(source, source_revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/merge_package.py", line 55, in _upstream_version_data
    changelog, _ignore = find_changelog(tree, False)
  File "/usr/lib/python2.7/dist-packages/bzrlib/plugins/builddeb/util.py", line 211, in find_changelog
    raise UnparseableChangelog(str(e))
bzrlib.plugins.builddeb.errors.UnparseableChangelog: There was an error parsing the changelog: Could not parse changelog: Badly formatted trailer line: -- Victor Thompson <email address hidden> Tue, 04 June 2013 11:45:00 -0400

[Sergio Schvezov (sergiusens)]

CI needs to fail and we need to move the pbuilderjenkins stuff to bzr bd