Clean up of integration-test base classes

- Remove TestConfig and instead use auto-configuration
- Add needed application.yml config
- Refactor helper methods for creating JSON

Issue-ID: CPS-2090
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I4f618a1d4a83e9c75e468928c257b817d449c22f
5 files changed