fix libvirtd permission error
fix libvirtd permission error

- run as root user, because travis cannot support group handling
- use rvmsudo instead of sudo
- export rvmsudo_secure_path to avoid rvmsudo warning

Signed-off-by: Hiroshi Miura <ff6fb3ed059786151e736af13627c08d24e9f922@linux.com>

adrahon/vagrant-kvm,adrahon/vagrant-kvm