Issue 816563: ultima-release: NotEnoughDutsError

From https://luci-milo.appspot.com/buildbot/chromeos/ultima-release/1984:

04:40:07: WARNING: Exception is not retriable return code: 3; command: /b/c/cbuild/repository/chromite/third_party/swarming.client/swarming.py run --swarming chromeos-proxy.appspot.com --task-summary-json /tmp/cbuildbot-tmpSNYcVq/tmpHNS82N/temp_summary.json --raw-cmd --task-name ultima-release/R66-10440.0.0-bvt-inline --dimension os Ubuntu-14.04 --dimension pool default --print-status-updates --timeout 14400 --io-timeout 14400 --hard-timeout 14400 --expiration 1200 '--tags=priority:Build' '--tags=suite:bvt-inline' '--tags=build:ultima-release/R66-10440.0.0' '--tags=task_name:ultima-release/R66-10440.0.0-bvt-inline' '--tags=board:ultima' -- /usr/local/autotest/site_utils/run_suite.py --build ultima-release/R66-10440.0.0 --board ultima --suite_name bvt-inline --pool bvt --file_bugs True --priority Build --timeout_mins 180 --retry True --max_retries 5 --minimum_duts 4 --suite_min_duts 6 --offload_failures_only False --job_keyvals "{'cidb_build_stage_id': 71750595L, 'cidb_build_id': 2331675, 'datastore_parent_key': ('Build', 2331675, 'BuildStage', 71750595L)}" -c
Priority was reset to 100
Triggered task: ultima-release/R66-10440.0.0-bvt-inline
chromeos-golo-server2-99: 3beaf211dd99d310 3
  Autotest instance created: cautotest-prod
  TestLabException: Not enough DUTs for board: ultima, pool: bvt; required: 4, found: 3
  Traceback (most recent call last):
    File "/usr/local/autotest/site_utils/run_suite.py", line 2034, in _run_task
      return _run_suite(options)
    File "/usr/local/autotest/site_utils/run_suite.py", line 1775, in _run_suite
      options.skip_duts_check)
    File "/usr/local/autotest/site_utils/diagnosis_utils.py", line 330, in check_dut_availability
      hosts=hosts)
  NotEnoughDutsError: Not enough DUTs for board: ultima, pool: bvt; required: 4, found: 3
  Will return from run_suite with status: INFRA_FAILURE
cmd=['/b/c/cbuild/repository/chromite/third_party/swarming.client/swarming.py', 'run', '--swarming', 'chromeos-proxy.appspot.com', '--task-summary-json', '/tmp/cbuildbot-tmpSNYcVq/tmpHNS82N/temp_summary.json', '--raw-cmd', '--task-name', u'ultima-release/R66-10440.0.0-bvt-inline', '--dimension', 'os', 'Ubuntu-14.04', '--dimension', 'pool', 'default', '--print-status-updates', '--timeout', '14400', '--io-timeout', '14400', '--hard-timeout', '14400', '--expiration', '1200', u'--tags=priority:Build', u'--tags=suite:bvt-inline', u'--tags=build:ultima-release/R66-10440.0.0', u'--tags=task_name:ultima-release/R66-10440.0.0-bvt-inline', u'--tags=board:ultima', '--', '/usr/local/autotest/site_utils/run_suite.py', '--build', u'ultima-release/R66-10440.0.0', '--board', u'ultima', '--suite_name', u'bvt-inline', '--pool', u'bvt', '--file_bugs', 'True', '--priority', 'Build', '--timeout_mins', '180', '--retry', 'True', '--max_retries', '5', '--minimum_duts', '4', '--suite_min_duts', '6', '--offload_failures_only', 'False', '--job_keyvals', "{'cidb_build_stage_id': 71750595L, 'cidb_build_id': 2331675, 'datastore_parent_key': ('Build', 2331675, 'BuildStage', 71750595L)}", '-c']
Autotest instance created: cautotest-prod
TestLabException: Not enough DUTs for board: ultima, pool: bvt; required: 4, found: 3
Traceback (most recent call last):
  File "/usr/local/autotest/site_utils/run_suite.py", line 2034, in _run_task
    return _run_suite(options)
  File "/usr/local/autotest/site_utils/run_suite.py", line 1775, in _run_suite
    options.skip_duts_check)
  File "/usr/local/autotest/site_utils/diagnosis_utils.py", line 330, in check_dut_availability
    hosts=hosts)
NotEnoughDutsError: Not enough DUTs for board: ultima, pool: bvt; required: 4, found: 3
Will return from run_suite with status: INFRA_FAILURE
04:40:07: INFO: Running cidb query on pid 23642, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7f59894b3f50>
04:40:07: ERROR: ** HWTest did not complete due to infrastructure issues (code 3) **
04:40:07: INFO: Translating result ** HWTest did not complete due to infrastructure issues (code 3) ** to fail.

Assigning to deputy.