ensure proper termination of server plugins when Greenwood process ends

[thescientist13]

Type of Change

• New Feature Request
• Documentation / Website
• Improvement / Suggestion
• Bug
• Other (please clarify below)

Summary

Should really import the stop methods for both servers in Greenwood. This is especially true for the live dev server, something the process does get shut down correctly and then an error could show with the live reload server still running in the background.

Details

This would apply to:

• plugin-live-reload
• plugin-graphql

Need to make sure there stop methods get called and appropriately shut everything both down, with the main use case being when a user does something like ctr+c to kill the dev server and so we would probably want to listen for a process exit callback?

Not sure if this could also be helpful for unit testing the dev server for #47 ?

[thescientist13]

Would also add for a build task, since we start servers for pre-rendering, this means we have to use process.exit in CLI entry point.