pull: retrieve bookmarks through bundle2

We can retrieve any pushkey namespace through bundle2. So we also ask for
bookmark data and use them to update the local repo.

mercurial/exchange.py

@@ -892,7 +892,7 b' def _pullbundle2(pullop):'
     kwargs['heads'] = pullop.heads or pullop.rheads
     kwargs['cg'] = pullop.fetch
     if 'b2x:listkeys' in remotecaps:
-        kwargs['listkeys'] = ['phase']
+        kwargs['listkeys'] = ['phase', 'bookmarks']
     if not pullop.fetch:
         pullop.repo.ui.status(_("no changes found\n"))
         pullop.cgresult = 0
@@ -922,6 +922,12 b' def _pullbundle2(pullop):'
         if namespace == 'phases':
             _pullapplyphases(pullop, value)
 
+    # processing bookmark update
+    for namespace, value in op.records['listkeys']:
+        if namespace == 'bookmarks':
+            pullop.remotebookmarks = value
+            _pullbookmarks(pullop)
+
 def _pullbundle2extraprepare(pullop, kwargs):
     """hook function so that extensions can extend the getbundle call"""
     pass