Create integration tests to verify the extension TLS behavior

[cwperks]

https://github.com/opensearch-project/opensearch-sdk-java/pull/619/files introduced settings that setup extension to run with TLS and connect with an OpenSearch node securely. In the security plugin, there are a suite of SSL Tests (See SSLTest) that verify the different TLS settings and verify cluster formation using TLS. For extensions, there should be a similar suite of tests with the different settings provided in SSLConfigConstants to verify that an OpenSearch node with the security plugin installed can communicate with an extension over a secure TLS channel.

[minalsha]

@ryanbogan @dbwiddis , @saratvemulapalli , @owaiskazi19 thoughts?

[dbwiddis]

I'm in favor. @cwperks would love you to help create these tests.

[owaiskazi19]

It's always good to have more tests.

[ryanbogan]

I agree as well. We should definitely have tests that ensure security and extensions are working together properly.