[2145] import isc.config explicitly, instead of the whole 'isc' package.

src/bin/bindctl/bindcmd.py

@@ -25,7 +25,7 @@ from bindctl.moduleinfo import *
 from bindctl.cmdparse import BindCmdParser
 from bindctl import command_sets
 from xml.dom import minidom
-import isc
+import isc.config
 import isc.cc.data
 import http.client
 import json