* Enhance the test for forbidden Schema changes
Current test is git-based. It is difficult to maintain and does not
catch out-of-order version numbers. It is also more aggressive than
necessary, failing on changes to submitted scripts that have not been
deployed yet.
The new test starts a database, deploys the current schema to it,
then deploys the set of Flyway scripts in this repository to the database.
* Check for post-deployment Flyway script changes
Add a script that checks for changes to scripts that
have been deployed to sandbox. This is test in to
be invoked in presubmit and ci.
Extracted common shell functions to an 'rc' file.
Also renamed existing script to be consistent with
other shell scripts.
