Verify working providers

[disprosium8]

• [x] FABRIC
• [x] Cloudlab (see #129)
• [x] Chameleon (TACC is OK, but STAR may be out of floating IPs)
• [ ] GCP (provisions but no dataplane peering/ping, see #113)
• [ ] AWS
• [x] SENSE-AWS (outstanding issue with AWS destroy (detach), unrelated to FabFed, see #112)
• [ ] SENSE-GCP (provisions but no dataplane peering/ping, see #113)
• [x] Janus (see #128)