Target to generate iso for testing.

(cherry picked from commit a03553aad6d182b2fbfa6deb7fba3bdd5f4eff92)
Define TRUENAS_COMPONENTS_ROOT to where trunnas files are.

This is where the TrueNAS build dir is pulled to pick out
parts used to generate TrueNAS.

(cherry picked from commit ee6c1bcc724f45fc1a43e5202e55d29985402ea7)
Make install_sata_dom.sh based on is_truenas.

(cherry picked from commit 6737cdb9be6621b883624ddb8133aba1435396d1)

Conflicts:
	build/create_iso.sh