Description of problem:

When building a package, tito generates inconsistent tag names, resulting in build failure

Version-Release number of selected component (if applicable):

tito-0.6.11-1

How reproducible:



Steps to Reproduce:
1. tito tag --accept-auto-changelog --keep-version --debug


Actual results:


...
Getting latest package info from: /home/bos/mlamouri/sample/ose/.tito/packages/
atomic-openshift
Command: awk '{ print $1 ; exit }' /home/bos/mlamouri/sample/ose/.tito/packages
/atomic-openshift
Status code: 0
Command output: 3.9.37-1

Traceback (most recent call last):
  File "/usr/bin/tito", line 23, in <module>
    CLI().main(sys.argv[1:])
  File "/usr/lib/python2.7/site-packages/tito/cli.py", line 203, in main
    return module.main(argv)
  File "/usr/lib/python2.7/site-packages/tito/cli.py", line 671, in main
    return tagger.run(self.options)
  File "/usr/lib/python2.7/site-packages/tito/tagger/main.py", line 114, in run
    self._tag_release()
  File "/home/bos/mlamouri/sample/ose/.tito/lib/origin/tagger/__init__.py", lin
e 40, in _tag_release
    super(OriginTagger, self)._tag_release()
  File "/usr/lib/python2.7/site-packages/tito/tagger/main.py", line 134, in _ta
g_release
    self._make_changelog()
  File "/usr/lib/python2.7/site-packages/tito/tagger/main.py", line 261, in _ma
ke_changelog
    output = self._generate_default_changelog(last_tag)
  File "/usr/lib/python2.7/site-packages/tito/tagger/main.py", line 213, in _ge
nerate_default_changelog
    output = run_command(patch_command)
  File "/usr/lib/python2.7/site-packages/tito/common.py", line 426, in run_comm
and
    raise RunCommandException(command, status, output)
tito.exception.RunCommandException: Error running command: git log --no-merges 
--pretty='format:%s (%ae)' --relative v3.9.37..HEAD -- .


Expected results:


...
Command: git tag -m "Tagging package [atomic-openshift] version [3.9.38-1] in d
irectory [./]." v3.9.38-1
Status code: 0
Command output: 


Created tag: v3.9.38-1
   View: git show HEAD
   Undo: tito tag -u
   Push: git push origin && git push origin v3.9.38-1


Additional info:

Github Issue: https://github.com/dgoodwin/tito/issues/312
Github patch PR pending: https://github.com/dgoodwin/tito/pull/314

Confirmed that this patch passes tests and works for my example