Fix issue #4789. Sort roles in by name

[w1ll-i-code]

Add a column 'name' with the name of the role to the role array so that it is possible to sort the roles by name.

[cla-bot]

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[w1ll-i-code]

Hi, is there something missing for this PR? please let me know so I can fix it in case.

[nilmerg]

For a start, a signed CLA ;)

[nilmerg]

Any update?

[lippserd]

@cla-bot check

[lippserd]

CLA was signed just recently for an Icinga 2 PR.

[nilmerg]

Your proposed changes are not quite correct. But they pointed me in the correct direction to actually understand the underlying problem. So I took the chance to fix this on my own, as I broke it as well originally. 😊 (#5285)

So thank you anyway :)