subrepo: store the ui object in the base class

This will be used in the next patch to print a warning from the base class.  It
seems better than having to explicitly pass it to a new method, since a lot of
existing methods also require it.

mercurial/subrepo.py

@@ -372,6 +372,9 b' def newcommitphase(ui, ctx):'
 
 class abstractsubrepo(object):
 
+    def __init__(self, ui):
+        self._ui = ui
+
     def storeclean(self, path):
         """
         returns true if the repository has not changed since it was last
@@ -508,6 +511,7 b' class abstractsubrepo(object):'
 
 class hgsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
+        super(hgsubrepo, self).__init__(ctx._repo.ui)
         self._path = path
         self._state = state
         r = ctx._repo
@@ -878,6 +882,7 b' class hgsubrepo(abstractsubrepo):'
 
 class svnsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
+        super(svnsubrepo, self).__init__(ctx._repo.ui)
         self._path = path
         self._state = state
         self._ctx = ctx
@@ -1108,6 +1113,7 b' class svnsubrepo(abstractsubrepo):'
 
 class gitsubrepo(abstractsubrepo):
     def __init__(self, ctx, path, state):
+        super(gitsubrepo, self).__init__(ctx._repo.ui)
         self._state = state
         self._ctx = ctx
         self._path = path