Add a script that uses the REST API to gather information from another
running layer index instance (e.g. layers.openembedded.org) and import
that into the local index. Only information for branches that are
already set up is imported, and only manually entered information -
no recipes, machines, etc.
Partially implements [YOCTO #9760].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
