[Travis] Use build-for-testing and test-without-building actions
[Travis] Use build-for-testing and test-without-building actions

This may be a workaround for Travis flakiness due to xcodebuild test timeouts:
https://github.com/travis-ci/travis-ci/issues/6422#issuecomment-262802695

mattrubin/onetimepassword,mattrubin/onetimepassword