CS-19: stub_service without RSpec mocks

[marian13]

What was done as a part of this PR?

• Created CanHaveStubbedResult plugin.
• Reimplemented stub_service without RSpec mocks.

Why it was done?

• To remove allow ... to receive.
• To mitigate stub_service does NOT mock in combination with delegate_to #22

How it was done?

• Using RSpec.current_example.

How to test?

• task rspec
• Development: Local Development#tests.

Open Questions?

• Ability to extend Standard config outside configs/standard.rb file.

Checklist:

• I have performed a self-review of my code.
• I have added/adjusted tests that prove my fix is effective or that my feature works.
• CI is green.

[coveralls]

Pull Request Test Coverage Report for Build 3721308502

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 85 of 85 (100.0%) changed or added relevant lines in 11 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 96.514%

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Totals
Change from base Build 3721269925:	0.3%
Covered Lines:	5731
Relevant Lines:	5938

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💛 - Coveralls

[marian13]