Move published artifacts to google storage

[mhagen-vmware]

User statement: As an engineer and customer of VIC, I want the builds artifacts to be published in an accessible and supported location

Details: We have decided to consolidate our image and binary storage locations and google has been chosen. We need to move the publishing over to the new location and orchestrate all the documentation and nightly testing and any other scripts that are pointing to bintray need to be moved in relatively close order. The change should be fairly easy using this guide:
https://github.com/drone-plugins/drone-google-cloudstorage/blob/master/DOCS.md

Acceptance criteria: Build artifacts and documentation all point to google cloud storage.

[mhagen-vmware]

@stuclem ^^ doc requirement

[mhagen-vmware]

@stuclem @karthik-narayan I am actively working on this story, and I am almost done. If all goes well, I should have a PR out today or tomorrow, which I will also tag you in.

[stuclem]

OK, thanks for the heads-up @mhagen-vmware

[karthik-narayan]

I'll be on the lookout.