vcs: Send custom repo-locked status code to the VCSServer.

rhodecode/lib/middleware/utils/scm_app_http.py

@@ -90,6 +90,7 b' class VcsHttpProxy(object):'
             'X-RC-Path-Info': environ['PATH_INFO'],
             # TODO: johbo: Avoid encoding and put this into payload?
             'X-RC-Repo-Config': base64.b64encode(config),
+            'X-RC-Locked-Status-Code': rhodecode.CONFIG.get('lock_ret_code')
         })
 
         data = environ['wsgi.input'].read()