Network plugin - support mocks in imported devices (#2040)
Network plugin - support mocks in imported devices (#2040)

Summary:
It is not currently possible to create mock routes from imported network logs.  This PR will provide that functionality.

See this issue for more details: https://github.com/facebook/flipper/issues/1988

## Changelog

Network plugin - create mocks from imported network logs

Pull Request resolved: https://github.com/facebook/flipper/pull/2040

Test Plan:
Use sample app to create network activity
Export network activity
Import network activity
Create mocks from imported network activity
Verify that mocks work using sample app

Reviewed By: mweststrate

Differential Revision: D26947187

Pulled By: passy

fbshipit-source-id: 5e4e0197c49bb7a8227a70e574613381815e6d30

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper