Add create account script

Using rc_util functions to send request message
 and subscribe for confirmation right after that

create_account.py

+#!/usr/bin/env python
+import sys
+import rc_util
+
+if len(sys.argv) < 2:
+    print("Usage: {} USERNAME [FULL_NAME] [REASON]".format(sys.argv[0]), file=sys.stderr)
+    exit(1)
+
+user_name = sys.argv[1]
+full_name = sys.argv[2] if len(sys.argv) >= 3 else ''
+reason    = sys.argv[3] if len(sys.argv) >= 4 else ''
+
+rc_util.add_account(user_name, full=full_name, reason=reason)
+print("Account requested for user: {}".format(user_name))
+
+print("Waiting for confirmation...")
+rc_util.consume(user_name)