Made performance improvements to test_bios_update.robot.

- Added code to call obmc_boot_test with 'REST Power Off' in skip
  mode.  This means that it will only perform the boot if the machine
  is not already at powered off state.
- Added FORCE_UPDATE option to allow caller to skip prep steps such
  as 'Trigger Warm Reset'.

Change-Id: I2808ebd9cf15d079b5956f157c09ffa2f23dac30
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
1 file changed