We need to support mellanox devices in disk images as well as ramdisks.
This adds the requisite element structure to provide that support.
Change-Id: Iaf383f5b32b84fbb69569ef42ec2460ab1b231e5
Flavour is overloaded in openstack due to it being used by nova. Element
seems to have the same feeling of combinability without using a term already
in active use in the openstack community.
Change-Id: Ia4c028d4062a8f69c66665821c94dd4bcdf06031