caches: use region conf from base class

vcsserver/git.py

@@ -140,7 +140,6 b' class GitRemote(RemoteBase):'
             "parents": self.parents,
             "_commit": self.revision,
         }
-        self.region = self._factory._cache_region
 
     def _wire_to_config(self, wire):
         if 'config' in wire:

vcsserver/hg.py

@@ -169,7 +169,6 b' class HgRemote(RemoteBase):'
             "hidden": self.ctx_hidden,
             "_file_paths": self.ctx_list,
         }
-        self.region = self._factory._cache_region
 
     def _get_ctx(self, repo, ref):
         return get_ctx(repo, ref)
@@ -652,6 +651,7 b' class HgRemote(RemoteBase):'
     @reraise_safe_exceptions
     def rev_range(self, wire, commit_filter):
         cache_on, context_uid, repo_id = self._cache_on(wire)
+
         @self.region.conditional_cache_on_arguments(condition=cache_on)
         def _rev_range(_context_uid, _repo_id, _filter):
             repo = self._factory.repo(wire)

vcsserver/svn.py

@@ -115,7 +115,6 b' class SvnRemote(RemoteBase):'
         # TODO: Remove once we do not use internal Mercurial objects anymore
         # for subversion
         self._hg_factory = hg_factory
-        self.region = self._factory._cache_region
 
     @reraise_safe_exceptions
     def discover_svn_version(self):

vcsserver/vcs_base.py

@@ -19,6 +19,10 b''
 class RemoteBase(object):
     EMPTY_COMMIT = '0' * 40
 
+    @property
+    def region(self):
+        return self._factory._cache_region
+
     def _cache_on(self, wire):
         context = wire.get('context', '')
         context_uid = '{}'.format(context)