SQL datasource code cleanup.

[paulfantom]

Description

Cleaning up datasource creation a bit

I've added a very rudimentary shell script to validate if datasources are able to query data. It is added as a shell script as we are approaching a test suite refactoring and I didn't want to complicate moving to new test suite.

Type of change

What type of changes does your code introduce to tobs? Put an x in the box that apply.

• [ ] CHANGE (fix or feature that would cause existing functionality to not work as expected)
• [x] FEATURE (non-breaking change which adds functionality)
• [ ] BUGFIX (non-breaking change which fixes an issue)
• [ ] ENHANCEMENT (non-breaking change which improves existing functionality)
• [ ] NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

[paulfantom]

Waiting for #450 first.

[paulfantom]

Fixes #443