[HTTP] Handle forked process timeout

[stefanprodan]

When the forked process doesn't respond to http calls, the watchdog could release the lock file to trigger a container restart.

Expected Behaviour

If the function http server timeouts, the watchdog should log the timeout exception and release the lock file.
Maybe implement a retry mechanism and exit after several timeouts?

Current Behaviour

Currently the watchdog only logs the http error without detection a timeout.

[alexellis]

Sounds like an interesting idea. How would you do that?

[alexellis]

@stefanprodan