Custom graceful shutdown is broken

[mikalai-ramashka]

Operating System

• [ x] Linux
• [ x] Windows 7
• [ x] Windows 10
• [ x] MacOS
• other:

NodeJS Version

• 0.x
• 4.x
• 6.x
• 7.x
• other: 12

Tmp Version

0.1

Expected Behavior

do not call process.exit(0);

Experienced Behavior

We have previously implemented graceful shutdown for our own goals (save data, close files, stop servers), but tmp just call process.exit(0) and stop correct exiting flow.

[silkentrance]

Duplicate of #193