Added ability to disable camera ping loop

[CamSoper]

Added an environment variable that indicates if the loop that pings the camera should be started. Myself and others have had problems with that ping causing the container to restart excessively.

The loop defaults to on. The environment variable is only necessary if you want to disable the ping.

Edit: Closing this to get it out of my "open PRs" list. The change is trivial, if anyone wants to make it locally and build a custom Docker image. Personally I replaced this container with the Dahua integration in HASS and it works perfectly.

[CamSoper]

Hi @dchesterton! Are there any questions about this PR? I've been merging your changes into my fork. I would really love if this change just got merged into the main branch.

[CamSoper]

Meh, screw it. Feel free to reopen. 🙂

[dchesterton]

Thanks for the PR but to be honest, I've not been happy with the ping solution in general and I've been looking at a better way to handle connections. Thankfully the latest version of the python-amcrest library raises a proper exception if/when the stream breaks so I've updated the app to use and removed the pinging functionaltiy entirely.