Add ':' for split of PATH in backup_file.rb

[nrathaus]

At the moment backup_file.rb support single path lookup, by adding the ability to use : delimiter you can now use the module with multiple paths at one 'run'

Step to recreate (the web server target I use, returns 200 OK on everything):

use scanner/http/backup_file
set PATH "/index.asp:/something.asp:/other.asp"
set RHOSTS 10.0.0.243

[+] Found http://10.0.0.243:80/index.asp.backup
[+] Found http://10.0.0.243:80/index.asp.bak
[+] Found http://10.0.0.243:80/index.asp.copy
[+] Found http://10.0.0.243:80/index.asp.copia
[+] Found http://10.0.0.243:80/index.asp.old
[+] Found http://10.0.0.243:80/index.asp.orig
[+] Found http://10.0.0.243:80/index.asp.temp
[+] Found http://10.0.0.243:80/index.asp.txt
[+] Found http://10.0.0.243:80/index.asp~
[+] Found http://10.0.0.243:80/.index.asp.swp
[+] Found http://10.0.0.243:80/something.asp.backup
[+] Found http://10.0.0.243:80/something.asp.bak
[+] Found http://10.0.0.243:80/something.asp.copy
[+] Found http://10.0.0.243:80/something.asp.copia
[+] Found http://10.0.0.243:80/something.asp.old
[+] Found http://10.0.0.243:80/something.asp.orig
[+] Found http://10.0.0.243:80/something.asp.temp
[+] Found http://10.0.0.243:80/something.asp.txt
[+] Found http://10.0.0.243:80/something.asp~
[+] Found http://10.0.0.243:80/.something.asp.swp
[+] Found http://10.0.0.243:80/other.asp.backup
[+] Found http://10.0.0.243:80/other.asp.bak
[+] Found http://10.0.0.243:80/other.asp.copy
[+] Found http://10.0.0.243:80/other.asp.copia
[+] Found http://10.0.0.243:80/other.asp.old
[+] Found http://10.0.0.243:80/other.asp.orig
[+] Found http://10.0.0.243:80/other.asp.temp
[+] Found http://10.0.0.243:80/other.asp.txt
[+] Found http://10.0.0.243:80/other.asp~
[+] Found http://10.0.0.243:80/.other.asp.swp
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed