configitems: register the 'server.bundle1' config

mercurial/configitems.py

@@ -113,6 +113,9 b" coreconfigitem('hostsecurity', 'disablet"
 coreconfigitem('patch', 'fuzz',
     default=2,
 )
+coreconfigitem('server', 'bundle1',
+    default=True,
+)
 coreconfigitem('ui', 'clonebundleprefers',
     default=list,
 )

mercurial/wireproto.py

@@ -608,7 +608,7 b' def bundle1allowed(repo, action):'
         if v is not None:
             return v
 
-    return ui.configbool('server', 'bundle1', True)
+    return ui.configbool('server', 'bundle1')
 
 def supportedcompengines(ui, proto, role):
     """Obtain the list of supported compression engines for a request."""