Add module to brute force the Cisco IronPort application
cisco_ironport_enum module

This module scans for Cisco Ironport SMA, WSA and ESA web login portals, finds AsyncOS version and performs login brute force to identify valid credentials.
new revision - cisco_ironport_enum

Added code to check successful conn first, so now if there is no connectivity on target port, script aborts run.
New check to ensure 'set-cookie' is set by the app as expected, before any further fingerprinting & b-f starts.
If the app is not Ironport, 'set-cookie' will not be set & remains null, and so script aborts run.
De-registered 'TARGETURI.'
Registered 'username' and 'password' with default value.
Changed some run messages.
And lastly, changed the csrf key piece cos I miss a cold beer right now.
[See RM 8114] - Reduce false positive if traffic is redirected

Fix complaint for hitting this false positive when the user has
all the traffic redirected.
updated module

removed the csrfkey parameter from login uri.
Check 200
Some cleanup, also remove TARGETURI because not registered by default
Land #2224 - Add brute force module for Cisco IronPort
Land #2231, @wchen-r7's patch for [SeeRM #8114]