Allow the use of enable_failover

[philwinder]

AFAIK, enable_failover: true doesn't work. The framework should failover correctly.

[mwl]

I've just tested it. From what I can see it actually works.

[philwinder]

Can you remind me about the intended behaviour? Maybe I misunderstand the command.

[mwl]

With failover enabled the framework will not deregister on Scheduler SIGTERM.
With failover disabled the framework will be deregistered on Scheduler SIGTERM.

What were your expectations?

[philwinder]

Ah ok. The problem I was having was when logstash wasn't setup correctly. Given that you set enable_failover: true. When an executor failed for some reason, it wasn't restarted. Eventually there would be no executors at all and the scheduler wouldn't start any. What's worse is that when I restarted the scheduler, it still didn't restart any executors, like it had some bad state.

The way I got it to work was to set enable_failover: false, correct my mistakes in configuration, and then everything has been working ever since.