Various fixes to the Vagrant configuration

* Commented out the "mirror://" format as it's down during test - change
back if required.
* Move from turning on AllowOverride to putting the rewrite in a new
entry in /etc/apache2/conf.d
* As a result of that, move cfm2 into it's own /var/www/ directory.
* Add a pointer to the /var/www/cfm2 directory