configitems: register the 'committemplate' section

mercurial/configitems.py

@@ -182,6 +182,10 b" coreconfigitem('commands', 'status.verbo"
 coreconfigitem('commands', 'update.requiredest',
     default=False,
 )
+coreconfigitem('committemplate', '.*',
+    default=None,
+    generic=True,
+)
 coreconfigitem('debug', 'dirstate.delaywrite',
     default=0,
 )