Fix RCTNetworking yellow box
Fix RCTNetworking yellow box

Summary:
Since `RCTNetworking` overrides init, it requires main queue setup. Native module infra currently throw a yellowbox if a module forgets it.

This diff fixes that.

{F361182429}

Changelog: [Internal]

Reviewed By: shergin

Differential Revision: D25962402

fbshipit-source-id: d847117cbfe0a191dc1882898711693c6fda68cd

myntra/react-native,javache/react-native,myntra/react-native,arthuralee/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,myntra/react-native,javache/react-native,javache/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,javache/react-native,facebook/react-native,arthuralee/react-native,pandiaraj44/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,arthuralee/react-native,janicduplessis/react-native,arthuralee/react-native,facebook/react-native,javache/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,arthuralee/react-native,pandiaraj44/react-native,javache/react-native,janicduplessis/react-native,pandiaraj44/react-native,janicduplessis/react-native,pandiaraj44/react-native