Added Force option to Meterpreter Reboot/Shutdown

I got annoyed with my test lab telling me other users are logged on to this machine and not rebooting when I told it to!

force 1 - Shutdown hung programs
force 2 - Try harder (and dont give the user a popup about other users).


meterpreter > reboot -h
Usage: reboot [options]

Reboot the remote machine.

OPTIONS:

    -f <opt>  Force a reboot, valid values [1|2]
    -h        Help menu.

meterpreter > reboot -f 2
Rebooting...
meterpreter >
[*] 192.168.1.122 - Meterpreter session 1 closed.  Reason: Died