======================================================================
ERROR: Test user_data_vsphere() where mount_cb fails.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/smoser-public/src/cloud-init/cloud-init/tests/unittests/test_datasource/test_altcloud.py", line 372, in test_user_data_vsphere
    self.assertEqual(False, dsrc.user_data_vsphere())
  File "/home/smoser-public/src/cloud-init/cloud-init/cloudinit/sources/DataSourceAltCloud.py", line 239, in user_data_vsphere
    cdrom_list = util.find_devs_with('LABEL=CDROM')
  File "/home/smoser-public/src/cloud-init/cloud-init/cloudinit/util.py", line 1218, in find_devs_with
    (out, _err) = subp(cmd, rcs=[0, 2])
  File "/home/smoser-public/src/cloud-init/cloud-init/cloudinit/util.py", line 1797, in subp
    errno=e.errno)
cloudinit.util.ProcessExecutionError: Unexpected error while running command.
Command: ['blkid', '-tLABEL=CDROM', '-odevice']
Exit code: -
Reason: [Errno 2] No such file or directory: 'blkid'
Stdout: -
Stderr: -
-------------------- >> begin captured logging << --------------------
cloudinit.util: DEBUG: Running command ['blkid', '-tLABEL=CDROM', '-odevice'] with allowed return codes [0, 2] (shell=False, capture=True)
--------------------- >> end captured logging << -------------