Add auto-input of serial number

1. Auto input serial number by matching regexp in 'lsusb -v' output
2. Add root cause of test fail after each testing is finished.
   This could help factory to quickly classify the fail cause on the
   line.

BUG=None
TEST=Manually, assume serial number is stored in iManufacturer field
Add the item to test_list (replace CameraIdentifier to vendor's name)

            OperatorTest(
                id='CameraPerformance',
                label_zh=u'相机效能',
                autotest_name='factory_CameraPerformanceAls',
                dargs={'test_type': 'Module',
                       'use_als': False,
                       'log_good_image' : True,
                       'auto_serial_number': ('CameraIdentifier', r'^\s*iManufacturer\s+\S+\s+(\S+)')
                     }),

Change-Id: Icd498c142772b2c066360cca595b080d442e0aed
Reviewed-on: https://gerrit.chromium.org/gerrit/57299
Reviewed-by: Tai-Hsu Lin <sheckylin@chromium.org>
Commit-Queue: Justin Chuang <jchuang@chromium.org>
Tested-by: Justin Chuang <jchuang@chromium.org>
2 files changed