Support Mercurial 4.1 in FishEye and Crucible

com.cenqua.fisheye.rep.RepositoryClientException: Problem with slurp - Fri Jan 20 15:04:56 UTC 2017: Repository index failed due to error
com.cenqua.fisheye.rep.RepositoryClientException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Error while communicating with VCS: ** Unknown exception encountered with possibly-broken third-party extension felog
** which supports versions unknown of Mercurial.
** Please disable felog and try your action again.
** If that fixes the bug please report it to the extension author.
** Python 2.7.3 (default, Oct 26 2016, 21:01:49) [GCC 4.6.3]
** Mercurial Distributed SCM (version 4.1-rc)
** Extensions loaded: felog
Traceback (most recent call last):
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/bin/hg", line 45, in <module>
    mercurial.dispatch.run()
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 63, in run
    sys.exit((dispatch(request(pycompat.sysargv[1:])) or 0) & 255)
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 129, in dispatch
    ret = _runcatch(req)
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 219, in _runcatch
    return callcatch(ui, _runcatchfunc)
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 227, in callcatch
    return scmutil.callcatch(ui, func)
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/scmutil.py", line 152, in callcatch
    return func()
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 208, in _runcatchfunc
    return _dispatch(req)
  File "/opt/bamboo-agent/bamboo-agent-home/xml-data/build-dir/FECRU-HGMATRIX-FECRUHGMATRIX29/output/hg-bin/mercurial-4.1-rc/fecru/lib/python2.7/site-packages/mercurial/dispatch.py", line 761, in _dispatch
    if not func.norepo:
AttributeError: 'function' object has no attribute 'norepo'