Update device agent to operate behind a proxy

[Steve-Mcl]

Acceptance criteria

• [x] Unit Tests
  • [x] no_proxy
  • [x] all_proxy
  • [x] http_proxy
  • [x] https_proxy
• [x] Manual tests behind a proxy for Windows
  • [x] Device Setup
    • [x] Web-ui setup method
    • [x] One Time Code setup method
    • [x] Provisioning Token
  • [x] NR 3.x
    • [x] Device Status updates
    • [x] Device Logs accessible
    • [x] Device Editor Tunnel
    • [x] Device Audit Logger (do a flow modification, should make an audit log entry)
    • [x] Grab a snapshot
    • [x] Apply a snapshot
    • [x] Restart from actions menu
    • [x] Project Link to/from an instance on staging
  • [x] NR 4.x
    • [x] Device Status updates
    • [x] Device Logs accessible
    • [x] Device Editor Tunnel
    • [x] Device Audit Logger (do a flow modification, should make an audit log entry)
    • [x] Grab a snapshot
    • [x] Apply a snapshot
    • [x] Restart from actions menu
    • [x] Project Link to/from an instance on staging
• [ ] Manual tests behind a proxy for Linux
  • [ ] Device Setup
    • [ ] Web-ui setup method
    • [ ] One Time Code setup method
    • [ ] Provisioning Token
  • [ ] NR 3.x
    • [ ] Device Status updates
    • [ ] Device Logs accessible
    • [ ] Device Editor Tunnel
    • [ ] Device Audit Logger (do a flow modification, should make an audit log entry)
    • [ ] Grab a snapshot
    • [ ] Apply a snapshot
    • [ ] Restart from actions menu
    • [ ] Project Link to/from an instance on staging
  • [ ] NR 4.x
    • [ ] Device Status updates
    • [ ] Device Logs accessible
    • [ ] Device Editor Tunnel
    • [ ] Device Audit Logger (do a flow modification, should make an audit log entry)
    • [ ] Grab a snapshot
    • [ ] Apply a snapshot
    • [ ] Restart from actions menu
    • [ ] Project Link to/from an instance on staging

NOTES: 1 operation should be carried out using http(s)_proxy and all_proxy 2. no_proxy should bypass all/http(s)_proxy causing traffic to go direct