note about migration bug
Merge branch 'metadata-update'

Conflicts:
	README.md
Merge branch 'metadata-update'
more documentation.
added create_image.py and removed create_metadata.py
updated README based on the latest code.
fixed a bug in a local block allocation function.
added the x flag to utility commands.
use more realistic values in the README example.
pass the UKAINodeErrorStateSet instance to a UKAIMetadata instance.
added sync_status to the hypervisor entry of the metadata.
removed _node_error_state_set variable.  we don't use it so far.
removed _node_error_state_set variable from UKAIMetadata class.  we don't use it so far.