detect unifi in ssh sessions

[h00die]

When SSHing to Ubiquiti Unifi devices, there was no detection of the platform.
We tack on the unifi OS version and board name (model) to the proof as well.

Pre:

resource (ubnt.rb)> run
[+] 111.111.1.111:22 - Success: 'admin:1111111111111111' 'uid=0(admin) gid=0(admin) Linux US-24 3.6.5 #1 SMP Fri Jan 25 16:34:35 MST 2019 armv7l GNU/Linux'
[*] Command shell session 1 opened (222.222.2.222:41243 -> 111.111.1.111:22) at 2019-03-12 20:34:06 -0400
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
[*] Starting persistent handler(s)...
msf5 auxiliary(scanner/ssh/ssh_login) > sessions

Active sessions
===============

  Id  Name  Type         Information                                    Connection
  --  ----  ----         -----------                                    ----------
  1         shell linux  SSH admin:1111111111111111 (111.111.1.111:22)  222.222.2.222:37601 -> 111.111.1.111:22 (111.111.1.111)

Post:

resource (ubnt.rb)> run
[+] 111.111.1.111:22 - Success: 'admin:1111111111111111' 'uid=0(admin) gid=0(admin) Linux US-24 3.6.5 #1 SMP Fri Jan 25 16:34:35 MST 2019 armv7l GNU/Linux unifi.version=5.10.19 board.name=USW-24 '
[*] Command shell session 1 opened (222.222.2.222:41243 -> 111.111.1.111:22) at 2019-03-12 20:34:06 -0400
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
[*] Starting persistent handler(s)...
msf5 auxiliary(scanner/ssh/ssh_login) > sessions

Active sessions
===============

  Id  Name  Type         Information                                    Connection
  --  ----  ----         -----------                                    ----------
  1         shell unifi  SSH admin:1111111111111111 (111.111.1.111:22)  222.222.2.222:37601 -> 111.111.1.111:22 (111.111.1.111)
msf5 auxiliary(scanner/ssh/ssh_login) > hosts

Hosts
=====

address        mac  name  os_name  os_flavor  os_sp  purpose  info  comments
-------        ---  ----  -------  ---------  -----  -------  ----  --------
111.111.1.111             unifi                                     

[wvu]

I think I handled your last one, and this looks reasonable to me.

[wvu]

Release Notes

This adds Ubiquiti UniFi platform detection to the SSH LoginScanner.