Optional domain item configuration

[DarwinOnLine]

Description

• Make compatible with Symfony console 4.x
• Allow to omit domain config item

Motivation and context

With these changes :

• The client can be used with Symfony 4+
• The client can perform a connection with NTLM Authentication without domain

How has this been tested?

$ composer test

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

• I have read the CONTRIBUTING document.
• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful.
• I have added tests to cover my changes.
• If my change requires a change to the documentation, I have updated it accordingly.

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