Small comment update according to PSR-2

See [PSR-2](http://www.php-fig.org/psr/psr-2/) paragraph 5.2

> There MUST be a comment such as `// no break` when fall-through is intentional in a non-empty case body.

Related to #11181
minor #11182 Small comment update according to PSR-2 (apfelbox)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11182).

Discussion
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Small comment update according to PSR-2

See [PSR-2](http://www.php-fig.org/psr/psr-2/) paragraph 5.2

> There MUST be a comment such as `// no break` when fall-through is intentional in a non-empty case body.

Related to #11181

Commits
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31b1dff Small comment update according to PSR-2
don't disable constructor calls to mockups of classes that extend internal PHP classes
Added missing `break` statement

Added missing `break` statement in `AbstractFindAdapter` - a fall through doesn't seem to be intended here.
bug #11186 Added missing `break` statement (apfelbox)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11186).

Discussion
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Added missing `break` statement

Added a missing `break` statement in `AbstractFindAdapter` - a fall-through doesn't seem to be intended here.

Commits
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5af2802 Added missing `break` statement
minor #11187 [Tests] don't disable constructor calls to mockups of classes that extend intern... (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Tests] don't disable constructor calls to mockups of classes that extend intern...

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Fixes the tests for the 2.3 branch as reported by @stof in #11176.

Commits
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2c726b8 don't disable constructor calls to mockups of classes that extend internal PHP classes
Add test for open_basedir use in ExecutableFinder
Correctly fetch ini setting using ini_get() rather than getenv()
Add tests for other aspects of the ExecutableFinder