New boot_results.add_row() method
New boot_results.add_row() method

Created new add_row method for boot_results class.

Also...
- Re-formatted comments.
- create_boot_table(): Added support for os_host argument vs relying on
  global.
- print_report: Added support for quiet argument
- update_boot_history:  New function.  Previously done in-line in
  print_test_start_message() in obmc_boot_test.py.
- print_boot_history:  New function.  Previously done in-line in
  print_defect_report() in obmc_boot_test.py.

Change-Id: If3754c0270c0c6ceebc6813e10757db9e83ef8d2
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation