traffic_cop kills TS process before it completes starting

Several things can slow traffic_server startup

• Long remap.config file
• Long list of certs in ssl_multicert.config (see TS-2058)
• Plugins that take too long to initialize

You end up with a race condition where traffic_server never starts because traffic_cop kills it before it completes.

There was a hack at Yahoo to address this - a YTS setting proxy.config.watch_sleep_time to change the heartbeat interval as a workaround. Doesn't seem like a practical solution for issues like TS-2058 where the heartbeat would need to be in minutes.