[image-based] fuel-agent can't deal with unlabeled disk

[Alexander Gordeev]

If disk doesn't contain any label (gpt, msdos, or other partition tables) it fails with:

2015-01-14 11:34:26.147 2039 DEBUG fuel_agent.utils.partition_utils [-] Info output:
Error: /dev/sda: unrecognised disk label

2015-01-14 11:34:26.156 2039 CRITICAL fuel-agent [-] IndexError: list index out of range
2015-01-14 11:34:26.156 2039 TRACE fuel-agent Traceback (most recent call last):
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/bin/provision", line 10, in <module>
2015-01-14 11:34:26.156 2039 TRACE fuel-agent sys.exit(provision())
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/cmd/agent.py", line 37, in provision
2015-01-14 11:34:26.156 2039 TRACE fuel-agent main(['do_provisioning'])
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/cmd/agent.py", line 67, in main
2015-01-14 11:34:26.156 2039 TRACE fuel-agent getattr(mgr, action)()
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/manager.py", line 303, in do_provisioning
2015-01-14 11:34:26.156 2039 TRACE fuel-agent self.do_partitioning()
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/manager.py", line 86, in do_partitioning
2015-01-14 11:34:26.156 2039 TRACE fuel-agent prt.end, prt.type))
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/utils/partition_utils.py", line 135, in get_make_partition_cmd
2015-01-14 11:34:26.156 2039 TRACE fuel-agent end <= x['end'] for x in info(dev)['parts']):
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/utils/partition_utils.py", line 57, in info
2015-01-14 11:34:26.156 2039 TRACE fuel-agent result = parse_partition_info(output)
2015-01-14 11:34:26.156 2039 TRACE fuel-agent File "/usr/lib/python2.6/site-packages/fuel_agent/utils/partition_utils.py", line 29, in parse_partition_info
2015-01-14 11:34:26.156 2039 TRACE fuel-agent 'size': utils.parse_unit(generic_params[1], 'MiB'),
2015-01-14 11:34:26.156 2039 TRACE fuel-agent IndexError: list index out of range
2015-01-14 11:34:26.156 2039 TRACE fuel-agent