Terminate in case of ext host IPC timeout

[solomatov]

This fixes a potential ext. host leak

The scenario is the following:

• ext host starts
• some listener, say timer, is started during the startup process
• in 60s we don't receive IPC socket, and reject
• rejection goes up to the main function
• we have a timer, and it keeps the process alive
• as a result we have a process leak

[solomatov]

cc @alexdima

[alexdima]

Thank you!