Improve logic used to detect changes in Deployment resource

[jgwest]

What does this PR do / why we need it:

• Deployment changes

  • Update the logic used to detect Deployment changes. See comment on 'normalizeDeployment' for details. TL;DR: to normalize a Deployment for comparison, we create a new Deployment struct, and copy in only the fields we care about (from the un-normalized Deployment).
  • Unit tests for these changes

• Related E2E test changes:

  • Move operator e2e test logic into shell script
  • Operator E2E tests should fail if the operator itself has unexpected ERROR log entries: added a check for this
  • Ability to set SKIP_RUN_STEP to skip starting operator in upstream rollouts test
  • Improve logic of 'waitAndGetE2EFileContents' to now check last 50 lines, rather than last 1 line

Have you updated the necessary documentation?

• [ ] Documentation update is required by this PR, and has been updated.

Which issue(s) this PR fixes: Fixes #47

How to test changes / Special notes to the reviewer:

[jgwest]

:+1: to all review comments, and all addressed. Thanks @jopit!