Inspect fails when the supervisor is running on an unexpected port.

[Gwahir]

Controller does not pull the active supervisorPort from .active-server.json. This can cause actions like inspect to fail if, as is the case for Firebase serve, the supervisor is running on an unexpected port.

In the pull request, the controller now handles cases where the active supervisor port differs from the config by reading the port value from .active-server.json in the same manner as the rest port.

• Tests and linter pass - minus gcloud connected tests
• Code coverage does not decrease (if any source code was changed) - again, minus gcloud elements
• Appropriate docs were updated (if necessary)

[Gwahir]

Noticed I gave the branch a bad name. Called it controller-serverPort-patch when it should be controller-supervisorPort-patch. Doesn't change the content of the pull request, but I thought I should mention the intent there.

[jmdobry]

Thanks!