GitHub Actions CI, bug fixes, and tests

[phudtran]

This PR fixes and adds the following:

• Adds CI via GitHub Actions
• Removes Travis CI (Travis org shutting down)
• Fixes multiple cluster bring-up issues with NoneType Error
• Fix for load transit CLI unit tests
• Adds new single deploy YAML
• Adds starter code for additional validation of operator errors in E2E tests
• Temporarily disables the following tests due to regressions/CI issues
  • Unit Test: Network Policy CLI
  • E2E Tests: Scaled EP test (Regression)
  • E2E Tests: Simple EP test (Fails in GitHub Actions but not locally, more debugging needed)

[vinaykul]

• E2E Tests: Simple EP test (Fails in GitHub Actions but not locally, more debugging needed)

I took a quick scan and it looks good. Just one question about the failing action - will it block successful CI after this is merged?

/lgtm

[phudtran]

• E2E Tests: Simple EP test (Fails in GitHub Actions but not locally, more debugging needed)

I took a quick scan and it looks good. Just one question about the failing action - will it block successful CI after this is merged?

/lgtm

Nope, I've disabled these for now, so they won't run

[vinaykul]

LGTM