Testing new urls accepted
gsutil is run on all supported gs urls

When the url contains "storage.googleapis.com" it is treated as
a google storage url and runs gsutil on it. This is eager and may
check urls that are not valid. In this case gsutil will fail and
the default correct behavior will occur.
  Enabled extglob so gsutil is run
Merge branch 'master' of https://github.com/GoogleCloudPlatform/compute-image-packages
Google Storage URLs are supported on startup.

The script should allow for the following gs urls:

http://storage.googleapis.com/bucket/object/
http://bucket.storage.googleapis.com/object/
http://commondatastorage.googleapis.com/bucket/object/
https://storage.googleapis.com/bucket/object/
https://bucket.storage.googleapis.com/object/
https://commondatastorage.googleapis.com/bucket/object/

commondata URLs are depricated but currently supported.