misc: remove unused random_string function

misc.py

@@ -1,15 +1,10 @@
 #!/usr/bin/env python
 
-import time, random, string, sys
+import time, sys
 
-""" return formatted timestamp """
 def timestamp():
+	"""Return formatted timestamp."""
 	return time.strftime('%H:%M:%S', time.gmtime())
 
-""" return some random string """
-def random_string(strlen=20):
-	return ''.join([random.choice(string.letters) for x in xrange(strlen)])
-
 def _log(strng, level='info'):
 	print '\r%s/%s\t%s' % (timestamp(), level, strng)
-