Updated from global requirements

Change-Id: I1a164ac0675d4a391b55cd7fbf4a30ec12041db9
Add support for 'driver-show' command

Now that the Ironic API supports getting individual drivers via
/v1/drivers/<driver_name>, a new 'driver-show' command is added
to the client.

Change-Id: Ia18ba75a9814f127b2db0ccbcb3f5b0f44045c7a
Merge "Updated from global requirements"
Avoid traceback with insufficient auth credentials

Raise an exception if configured credentials are not sufficient
for obtaining an endpoint and token.

Change-Id: Ie11a25eb67da2d2c2c8ef40ab984eb2ecb77fdf9
Closes-Bug: 1290601
Merge "Avoid traceback with insufficient auth credentials"