ui.py: remove revlogopts and (unused) diffcache variables

This should make the [revlog] section in a .hg/hgrc file be respected
when there's still no changelog.

mercurial/localrepo.py

@@ -54,7 +54,7 b' class localrepository(repo.repository):'
         except IOError:
             pass
 
-        v = self.ui.revlogopts
+        v = self.ui.configrevlog()
         self.revlogversion = int(v.get('format', revlog.REVLOG_DEFAULT_FORMAT))
         self.revlogv1 = self.revlogversion != revlog.REVLOGV0
         fl = v.get('flags', None)

mercurial/ui.py

@@ -30,8 +30,6 b' class ui(object):'
             self.traceback = traceback
 
             self.updateopts(verbose, debug, quiet, interactive)
-            self.diffcache = None
-            self.revlogopts = self.configrevlog()
         else:
             # parentui may point to an ui object which is already a child
             self.parentui = parentui.parentui or parentui