Add information about virtualbox guest vagrant plugin
Add information about virtualbox guest vagrant plugin

loles/solar,openstack/solar,Mirantis/solar,zen/solar,loles/solar,loles/solar,pigmej/solar,zen/solar,zen/solar,loles/solar,pigmej/solar,zen/solar,Mirantis/solar,Mirantis/solar,Mirantis/solar,openstack/solar,pigmej/solar,openstack/solar