[google compute] Add support for subnetworks #780
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Adding support subnetworks to GCE driver
Description
This PR adds support Google Compute Engine's subnetworks feature[1]. When this feature was introduced, Google suggested users begin using automatically allocated regional subnetworks versus a single global network. The GCE driver predates subnetworks, so the default is still set to create legacy networks, even though this is no longer recommended.
Subnetworks are a necessary prerequisite for other GCE networking features that will be added to libcloud shortly.
[1] https://cloud.google.com/compute/docs/subnetworks
Status
I intend to leave this PR open for community review for 7 days and will merge it to trunk if there are no outstanding issues on 10-May-2016.
Checklist (tick everything that applies)