obsolete: rename divergent volatile set into contentdivergent volatile set

The renaming is done according to
https://www.mercurial-scm.org/wiki/CEDVocabulary.

Differential Revision: https://phab.mercurial-scm.org/D254

mercurial/context.py

@@ -237,7 +237,7 b' class basectx(object):'
 
         Only non-public and non-obsolete changesets may be divergent.
         """
-        return self.rev() in obsmod.getrevs(self._repo, 'divergent')
+        return self.rev() in obsmod.getrevs(self._repo, 'contentdivergent')
 
     def troubled(self):
         msg = ("'context.troubled' is deprecated, "

mercurial/obsolete.py

@@ -968,6 +968,14 b' def _computebumpedset(repo):'
 
 @cachefor('divergent')
 def _computedivergentset(repo):
+    msg = ("'divergent' volatile set is deprecated, "
+           "use 'contentdivergent'")
+    repo.ui.deprecwarn(msg, '4.4')
+
+    return _computecontentdivergentset(repo)
+
+@cachefor('contentdivergent')
+def _computecontentdivergentset(repo):
     """the set of rev that compete to be the final successors of some revision.
     """
     divergent = set()

mercurial/revset.py

@@ -732,8 +732,8 b' def contentdivergent(repo, subset, x):'
     """
     # i18n: "contentdivergent" is a keyword
     getargs(x, 0, 0, _("contentdivergent takes no arguments"))
-    divergent = obsmod.getrevs(repo, 'divergent')
-    return subset & divergent
+    contentdivergent = obsmod.getrevs(repo, 'contentdivergent')
+    return subset & contentdivergent
 
 @predicate('extinct()', safe=True)
 def extinct(repo, subset, x):