This patch writes a warning out to stderr to notify element authors
that may be using map-packages to migrate to pkg-map. This patch
also prints out a warning during image-create that lists the specific
elements that are not using pkg-map.
Change-Id: I7e2a7611dd5650815736ce998aa94a7833193d06
Adds a new pkg-map element which can be used to install
packages based on an in element 'pkg-map' JSON config
file format.
As part of this change we expose DIB's IMAGE_ELEMENT variable
so that we can have access to the element names which are being
installed in a clean manner.
This change is intended to decouple elements from DIB
and allow new elements to support multiple distributions
(with various package naming schemes) without having to
constantly maintain DIB's various bin/map-packages files.
Change-Id: Ic0a061995e2ae708c95a535cba6237bff58f7d93
