convert: mercurial source: convert global tags only - not local tags

Mercurial tags can be local (tag -l, stored in .hg/localtags) or global (normal
tags, tracked in .hgtags) ... or extensions can add other kind of tags.

Convert would take all tags (except "tip"), not just the ones from .hgtags, and
put them into .hgtags.

Instead, convert only the global tags that come from .hgtags.

hgext/convert/hg.py

@@ -394,7 +394,9 b' class mercurial_source(converter_source)'
                       sortkey=ctx.rev())
 
     def gettags(self):
-        tags = [t for t in self.repo.tagslist() if t[0] != 'tip']
+        # This will get written to .hgtags, filter non global tags out.
+        tags = [t for t in self.repo.tagslist()
+                if self.repo.tagtype(t[0]) == 'global']
         return dict([(name, hex(node)) for name, node in tags
                      if self.keep(node)])
 

tests/test-convert-hg-sink.t

@@ -16,8 +16,10 b''
   $ echo file > foo/file
   $ hg ci -qAm 'add foo/file'
   $ hg tag some-tag
+  $ hg tag -l local-tag
   $ hg log
   changeset:   3:593cbf6fb2b4
+  tag:         local-tag
   tag:         tip
   user:        test
   date:        Thu Jan 01 00:00:00 1970 +0000