Rename the result phase to subresult

[seberm]

In today's review meeting, we discussed that it might be a good idea to use a different name for "phase" results, such as "subresult".

The term "phase" was initially used in reference to beakerlib and the rlPhase{Start,End} functions. However, the name should be probably more general and not dependent on the used framework. Additionally, the phase keyword is used internally for different purposes.

This relates to:

• Extend results schema to allow test phases #2933
• Propagate result phase into the report plugins #3094
• Add support for test phases #2826

CC: @happz, @thrix, @psss

Pull Request Checklist

• implement the feature
• update the specification
• modify the json schema
• mention the version

[seberm]

Do you have any additional ideas or suggestions? Are there any other places where the rename needs to be applied?

[psss]

Yeah, makes sense. Looks good, just one typo.

[psss]

Thanks!

[thrix]

LGTM, as there is nobody using this, so it should not break Testing Farm or any other user.