configitems: register the 'logtoprocess.commandfinish' config

mercurial/configitems.py

@@ -371,6 +371,9 b" coreconfigitem('http_proxy', 'user',"
 coreconfigitem('logtoprocess', 'commandexception',
     default=None,
 )
+coreconfigitem('logtoprocess', 'commandfinish',
+    default=None,
+)
 coreconfigitem('merge', 'checkunknown',
     default='abort',
 )