Mis-detecting OPAL shutdown message as a hostboot error

[oohal]

Spotted this on a op-build CI job:

/proc/249/task/249/net/igmp
/proc/249/task/249/net/raw6
/proc/249/task/249/net/snmp
/proc/249/task/249/net/stat
/proc/249/task/249/net/stat/rt_cache
/proc/249/task/249/net/stat/arp_cache
^Z[1]+  Stopped                    find /
[console-expect]#[  718.461355761,5] IPMI: Soft shutdown requested
^MRequesting system poweroff
[  168.244801] reboot: Power down
[  733.463486354,5] OPAL: Shutdown request type 0x0...

^M--== Welcome to SBE - CommitId[0x2d51dbbb] ==--
^Mistep 3.19
2020-03-10 21:02:15,777:op-test.common.OpTestSystem:run_IPLing:ERROR:Detected hostboot got IPMI shutdown request
^MERROR (180.384s)
  runTest (testcases.Console.ControlC) ... ERROR (0.001s)
  runTest (testcases.OpTestPNOR.Skiroot) ... ERROR (0.001s)
  runTest (testcases.DeviceTreeValidation.DeviceTreeValidationSkiroot) ... ERROR (0.001s)
  runTest (testcases.gcov.Skiroot) ... ERROR (0.001s)
  runTest (testcases.DPO.DPOSkiroot) ... ERROR (0.001s)
  runTest (testcases.PetitbootMMU.PetitbootMMU) ... ERROR (0.001s)

======================================================================
ERROR [180.384s]: runTest (testcases.Console.ControlZ)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/testcases/Console.py", line 192, in runTest
    self.cv_SYSTEM.goto_state(OpSystemState.PETITBOOT_SHELL)
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 389, in goto_state
    self.state = self.stateHandlers[self.state](state)
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 725, in run_IPLing
    raise e
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 721, in run_IPLing
    loop_max=self.ipl_watermark, timeout=self.ipl_timeout)
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 1533, in wait_for_it
    return super(OpTestOpenBMCSystem, self).wait_for_it(**kwargs)
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 582, in wait_for_it
    check_expect_seq=expect_seq, check_expect_dict=kwargs['expect_dict'])
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 642, in check_it
    raise e
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 634, in check_it
    my_r=check_r, value=check_expect_seq[check_r])
  File "/tmp/hostboot-jenkins.swg-devops/jenkins-slave/workspace/Hostboot/OpenPower/HW/p9-test-param/op-test/common/OpTestSystem.py", line 208, in hostboot_callback
    raise HostbootShutdown()
common.Exceptions.HostbootShutdown: Detected hostboot got IPMI shutdown request

Looks like OpExpect is matching on "shutdown requested" which is too broad.