Remove trailing colon and GID from password and unlink temp files

Bug leaves trailing :(GID) on passwords and does not remove temporary wordlist and hashlist files.

Tested against latest, fully updated AMD64 Kali release on 01 Apr 2014.

Steps to duplicate bugs:
- [ ] Install Kali and update to the latest version
- [ ] load msfconsule
- [ ] use auxiliary/scanner/ssh/ssh_login
- [ ] set username root
- [ ] set passwoed toor
- [ ] set rhosts (local IP address, not loopback)
- [ ] exploit -j
- [ ] use post/linux/gather/hashdump
- [ ] set session 1
- [ ] exploit -j
- [ ] use auxiliary/analyze/jtr_linux
- [ ] set crypt true
- [ ] exploit -j
- [ ] creds

Note that creds will now show a password of "toor:0" for root. Also note that there are now 2 temporary files in /tmp/ beginning with jtrtmp.