Overcloud deploy fails because root disk is not correctly found

Issue

• defining root disk fails because serial is in capital letters
• defining root device in capital letters causes deployment to fail.
• ironic-conductor.log

2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor [req-7a5d33c0-50f7-442f-bea4-8c1995eebea1 - - - - -] Asynchronous exception for node 34caa2a8-3018-415c-9801-09ca3424b0ed: Node failed to get image for deploy. Exception: Failed to deploy instance: Failed to start the iSCSI target to deploy the node 34caa2a8-3018-415c-9801-09ca3424b0ed. Error: {u'message': u"Error finding the disk or partition device to deploy the image onto: No suitable device was found for deployment using these hints {u'serial': u'PK2134P6J905GX'}", u'code': 404, u'type': u'DeviceNotFound', u'details': u"No suitable device was found for deployment using these hints {u'serial': u'PK2134P6J905GX'}"}
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor Traceback (most recent call last):
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic/drivers/modules/agent_base_vendor.py", line 482, in heartbeat
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     self.continue_deploy(task)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic_lib/metrics.py", line 61, in wrapped
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     result = f(*args, **kwargs)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic/conductor/task_manager.py", line 138, in wrapper
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     return f(*args, **kwargs)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic/drivers/modules/iscsi_deploy.py", line 381, in continue_deploy
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     uuid_dict_returned = do_agent_iscsi_deploy(task, self._client)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic_lib/metrics.py", line 61, in wrapped
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     result = f(*args, **kwargs)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor   File "/usr/lib/python2.7/site-packages/ironic/drivers/modules/iscsi_deploy.py", line 308, in do_agent_iscsi_deploy
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor     raise exception.InstanceDeployFailure(reason=msg)
2017-06-28 11:58:40.997 1490 ERROR ironic.drivers.modules.agent_base_vendor InstanceDeployFailure: Failed to deploy instance: Failed to start the iSCSI target to deploy the node 34caa2a8-3018-415c-9801-09ca3424b0ed. Error: {u'message': u"Error finding the disk or partition device to deploy the image onto: No suitable device was found for deployment using these hints {u'serial': u'PK2134P6J905GX'}", u'code': 404, u'type': u'DeviceNotFound', u'details': u"No suitable device was found for deployment using these hints {u'serial': u'PK2134P6J905GX'}"}