Clean up Spanner before merging to master#3362

yihanzhen merged 6 commits into

googleapis:spanner-gapic-migrationgoogleapis/google-cloud-java:spanner-gapic-migrationfrom

yihanzhen:spanner-gapic-migration-configurationyihanzhen/google-cloud-java:spanner-gapic-migration-configurationCopy head branch name to clipboard