scm: handle "bitbucketweb" browser for mercurial

The Git SCM uses "bitbucketweb".

The Hg SCM also has "bitbucketweb" documented, but uses an un-documented
value instead: "bitbucket".

Make the Hg SCM support "bitbucketweb" so it aligns with the Git SCM and
the Hg documentation.

Continue to handle the old "bitbucket" browser, but add a comment that
this is deprecated.

Change-Id: If4266e35964b2d7c751cce009d195d4c1bcf845a

jenkins_jobs/modules/scm.py

@@ -1092,7 +1092,8 @@ def hg(self, xml_parent, data):
     browser = data.get('browser', 'auto')
     browserdict = {
         'auto': '',
-        'bitbucket': 'BitBucket',
+        'bitbucket': 'BitBucket',  # deprecated
+        'bitbucketweb': 'BitBucket',
         'fisheye': 'FishEye',
         'googlecode': 'GoogleCode',
         'hgweb': 'HgWeb',