configitems: register the 'hostsecurity.ciphers' config

mercurial/configitems.py

@@ -104,6 +104,9 b" coreconfigitem('devel', 'serverrequirece"
 coreconfigitem('devel', 'strip-obsmarkers',
     default=True,
 )
+coreconfigitem('hostsecurity', 'ciphers',
+    default=None,
+)
 coreconfigitem('patch', 'fuzz',
     default=2,
 )