[CLI] Support sub-paths in generate rest-api

[LoicPoullain]

Issue

Resolves #862.

Solution and steps

• Refactor createController tests.
• Refactor createRestApi tests.
• Allow sub-paths in createRestApi.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov-io]

Codecov Report

Merging #878 (1165c76) into v2-2-0 (cc40822) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           v2-2-0     #878   +/-   ##
=======================================
  Coverage   98.91%   98.91%           
=======================================
  Files          82       82           
  Lines        1654     1654           
  Branches      398      398           
=======================================
  Hits         1636     1636           
  Misses         18       18           

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