Install a default ganesha.conf file

- Convert the vfs.conf file so it cannot run by default, rather than
  having it export /home
- Install it in the proper prefix location, makeing sure not to clobber
  any existing config file

Signed-off-by: Daniel Gryniewicz <dang@linuxbox.com>
Install config_samples into /usr/share/doc

Signed-off-by: Daniel Gryniewicz <dang@linuxbox.com>