LAVA jobs: create jobs using releng

LAVA jobs: create jobs using releng

Switch to using releng-scripts "create-jobs" util for creating LAVA
jobs from new templating system.

For beta-testing, only use for QEMU and m3ulcb for now

(Yes, the if/else/endif without nesting is ugly, but makes the
 patch easier to read without all the whitespace change for
 indents.  Whitespace can be updated in a follow-up if this
 change is accepted.)

Change-Id: I46c4f97927515c1772fdef9842f041ef2be60000
Signed-off-by: Kevin Hilman <khilman@baylibre.com>