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:
1. Install Kali and update to the latest version
2. load msfconsule
&nbsp;&nbsp;a. use auxiliary/scanner/ssh/ssh_login
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i. set username root
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ii. set passwoed toor
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iii. set rhosts (local IP address, not loopback)
&nbsp;&nbsp;b. exploit -j
&nbsp;&nbsp;c. use post/linux/gather/hashdump
&nbsp;&nbsp;d. set session 1
&nbsp;&nbsp;e. exploit -j
&nbsp;&nbsp;f. use auxiliary/analyze/jtr_linux
&nbsp;&nbsp;g. set crypt true
&nbsp;&nbsp;h. exploit -j
&nbsp;&nbsp;i. 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.