AWS support

[hkonsti]

• [x] create cloud provider interface
• [x] move gcloud functions over
• [x] replace all occurrences in the code with new interface functions
  • [x] update create worker endpoint
  • [x] update list workers endpoint
  • [x] update pause, resume, delete
• [ ] add aws authentication
• [ ] make sdk changes
• [ ] write new tests
• [ ] monitoring

[hkonsti]

this is out of date