Update get_metadata_value to use v1 metadata server url.
Update get_metadata_value to use v1 metadata server url for instance with fallback to project.
Cleanup get_metadata_value script, removed attributes/ path.
Add quotes around printf in get_metadata_value to print multi-line responses.
Merge pull request #70 from jeremyje/master

Update get_metadata_value to use v1 metadata server url.