Solve remote MFA websocket routing

[j-chmielewski]

The problem:

• Remote MFA is started by the desktop client and finished by mobile app
• Desktop client waits (websocket) for the MFA flow to be completed by mobile app
• Websocket and MFA finish requests can be handled by different proxy instances
• Both proxies need to get the response to the mfa finish flow
  • Desktop client needs to get the preshared key
  • Mobile client needs to get MFA flow response (success/failure)

Result: Remote MFA process can be completed on a multi-proxy setup regardless of which requests go to which proxy.