Added support for concatenating multiple LDAP attributes in displayName

[MatthieuLeboeuf]

Hello

To resolve #1684 and the next of #5288

I've made the requested changes, but I can't seem to fix the test error. Do you have any ideas ?

[ssddanbrown]

Thanks again for providing this @MatthieuLeboeuf!
I followed this up with 90341e0 just to mainly add test coverage for this feature.

Not certain what test was originally failing for you, but it might have been due to the ordering being changed via the merge of attributes when pulling back user data, which would have meant (after filtering away of a null thumbnail attribute) that the display name attribution in the test would be at a different index to what's expected.
In my commit I've altered this to be array expansion at the original array location instead.

This will be part of the next feature release.

Docs Updates

• Document ability to use mulitple attributes via LDAP_DISPLAY_NAME_ATTRIBUTE="firstname|lastname" syntax.