vagrant_variables.yml.sample: Add openSUSE box
vagrant_variables.yml.sample: Add openSUSE box

Add comment for the appropriate openSUSE box for testing.

Signed-off-by: Markos Chandras <33d8b43ece1558bd62b361ce5e954c5d9a97a7a2@suse.de>

fgal/ceph-ansible,font/ceph-ansible,font/ceph-ansible,ceph/ceph-ansible,ceph/ceph-ansible,travmi/ceph-ansible,travmi/ceph-ansible,fgal/ceph-ansible