It makes more sense for grub to be installed by the vm element, since
that is intended to produce directly bootable disk images.
Change-Id: Ic340ba9d3ec4dbeea3aed3576fc899c1424783a2
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