Fix controller IP parsing in "nsb_setup.sh" script

Fix controller IP parsing in "nsb_setup.sh" script

Fixed the controller IP parsing in "nsb_setup.sh" script. The new
regex expression now accepts "OS_AUTH_URL" as:
  * http://10.237.223.168/identity
  * http://10.237.223.168:5000/identity
  * http://hostname/identity
  * http://hostname:5000/identity

JIRA: YARDSTICK-829

Change-Id: Ifaeab991bcbb6aa7b22c3533ab7554527184878b
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
(cherry picked from commit b5e35986a77831841b064e435a6041a121634bec)