WIP: Handle connections to Cockpit when Exosphere is running in a web browser

Fixes #245 (closed).

Plan:

• Figure out where to store SHA-256 fingerprint of self-signed certificate
  • See if it can be stored in instance metadata (what is the size limit?)
• Generate private key, certificate, and fingerprint when user creates an instance (or browses to the launch instance view)
• Our forge needs util.isNodejs = false;?
• TODO finish plan

How to Test

(Please describe how to exercise these changes in the application)

Screenshots

(If visual changes are introduced, show what they look like)