caches: fixes the file-store backend to use serialized names for filename cache of vcsserver.

Using ones with '/' would crash the backend

rhodecode/lib/vcs/client_http.py

@@ -185,8 +185,9 b' class RemoteRepo(object):'
         self.url = remote_maker.url
         self.stream_url = remote_maker.stream_url
         self._session = remote_maker._session_factory()
+        cache_repo_id = self._repo_id_sanitizer(repo_id)
         self._cache_region, self._cache_namespace = \
-            remote_maker.init_cache_region(self._repo_id_sanitizer(repo_id))
+            remote_maker.init_cache_region(self._repo_id_sanitizer(cache_repo_id))
 
         with_wire = with_wire or {}
 
@@ -194,6 +195,7 b' class RemoteRepo(object):'
         self._wire = {
             "path": path,  # repo path
             "repo_id": repo_id,
+            "cache_repo_id": cache_repo_id,
             "config": config,
             "repo_state_uid": repo_state_uid,
             "context": self._create_vcs_cache_context(path, repo_state_uid)