Add diff_tests.sh to getting-started-java#366

Merged

kurtisvg merged 1 commit intoGoogleCloudPlatform:masterfrom

dzlier-gcp:master

Feb 16, 2018

Commits on Feb 16, 2018

Add .kokoro/tests/diff_tests.sh to only run tests on changed files during presubmit.
dzlier-gcp
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