Add --localSchemaFile to service:check

[fsouza]

Fix #716.

TODO:

• Update CHANGELOG.md* with your change (include reference to issue & this PR)
• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass

*Make sure changelog entries note which project(s) has been affected. See older entries for examples on what this looks like.

[apollo-cla]

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[fsouza]

Re: tests, if the approach looks correct, I can take a look at adding tests for service:check and the change.

[JakeDawkins]

@fsouza thanks for this! I have another PR open right now re-enabling some old disabled tests, so I'll add the test for this flag there (#1198)

[fsouza]

@JakeDawkins sounds good, thanks for merging it! :D