layerman: add support for multiple commands
layerman: add support for multiple commands

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

Angstrom-distribution/setup-scripts,Ambertec/setup-scripts,wwright2/angstrom-setup.methode