[#4581] CS fixes, composer updates

- Import hostname validator
- CS around arguments for hostname validator constructor
- Added zend-validator to required components, as it's used for hostname
  validation
Merge branch 'hotfix/4581'

Close #4581
Merge branch 'hotfix/4581' into develop

Forward port #4581
Merge pull request #4582 from noopable/hotfix/nested-form-elementsname-wrapping

Fix Nested form element wrapping (relative: #4383)
Merge branch 'hotfix/4582'

Close #4582
Merge branch 'hotfix/4582' into develop

Forward port #4582
Merge pull request #4595 from piteer1/hotfix-redis-storage

[BUG] Missing invokable fo Redis Cache Storage, problem with setting password
Merge branch 'hotfix/4595'

Close #4595
Merge branch 'hotfix/4595' into develop

Forward port #4595
Merge pull request #4596 from PierreRambaud/patch-1

Missing french translations, and wrong class name
Merge branch 'hotfix/4596'

Close #4596
Merge branch 'hotfix/4596' into develop

Forward port #4596
Merge pull request #4597 from siad007/zendValidateHostnameUA

Zend_Validate_Hostname doesn't handle IDN for .UA
Merge branch 'hotfix/4597'

Close #4597
Merge branch 'hotfix/4597' into develop

Forward port #4597
Break data provider and test case in two

- to fix segfault when running under 5.3.3
Merge branch 'hotfix/tests' into develop

Fix test segfaults in Zend\Form tests
Merge pull request #4599 from radnan/patch-1

[InputFilter] Input merge should copy over the "continue_if_empty" flag
[#4599] Added test for behavior

- Ensure continueIfEmpty flag is merged
Merge branch 'hotfix/4599'

Close #4599