[jaeger] Allow overriding image registry at the global level

[bens545]

What this PR does

• Splits image registry, repository, and tag. Allowing for overriding of any one without affecting the other
• Allow overriding the image registry in the global config
• Allow setting the pullSecrets at the global level

Which issue this PR fixes

• relates to #182

Checklist

• [x] DCO signed
• [x] Commits are GPG signed
• [x] Chart Version bumped
• [x] Title of the PR starts with chart name ([jaeger] or [jaeger-operator])
• [x] README.md has been updated to match version/contain new values

[Stevenpc3]

👍

[bens545]

I removed the registry to bring it in line with what was previously there. (Instead of making it registry.hub.docker.com). It should be able to pull the images now.