test: normalize test case names

[rical]

Description

Normalize test case names to title case and add name for cases called from the top level all.yaml suite.
This is a purely cosmetic change.

Checklist

Tick relevant boxes, this PR is-a or has-a:

• Bugfix
  • Regression tests
  • ChangeLog updates (for next release)
• Feature
  • YANG model change => revision updated?
  • Regression tests added?
  • ChangeLog updates (for next release)
  • Documentation added?
• Test changes
  • Checked in changed Readme.adoc (make test-spec)
  • Added new test to group Readme.adoc and yaml file
• Code style update (formatting, renaming)
• Refactoring (please detail in commit messages)
• Build related changes
• Documentation content changes
  • ChangeLog updated (for major changes)
• Other (please describe):

[troglobit]

Agreed 90%, I suggest keeping lowercase for articles, conjunctions, and prepositions. As per grammarly.com recommendations:

In English, capitalize the first and last word of a title, along with all major words—nouns, pronouns, verbs, adjectives, and adverbs. Lowercase articles (a, an, the), coordinating conjunctions (and, but, or), and short prepositions (at, by, for, in, to) unless they start or end the title.

E.g., "NTP Server and Client Interoperability" or "Tunnel Interface Bridged with Physical"