ao-bringup: Improve igniter testing. Add TeleMega and TeleMetrum testing.

The script lets you re-try each one when they fail, which is nice if
you're hand-holding the setup.

The TeleMetrum and TeleMega tests are adapted from the EasyMega tests
and are hooked up to the turnon scripts.

Signed-off-by: Keith Packard <keithp@keithp.com>