[trac544] use the path for the installed python modules.

src/bin/usermgr/b10-cmdctl-usermgr.py.in

@@ -24,7 +24,7 @@ from hashlib import sha1
 import csv
 import getpass
 import getopt
-import sys
+import sys; sys.path.append ('@@PYTHONPATH@@')
 import isc.util.process
 
 isc.util.process.rename()