make adLDAP function public again. #1616

It seems some update of the adLDAP library made a crucial function
protected, thus breaking the authad plugin.

This just makes the function public again, wh

make adLDAP function public again. #1616

It seems some update of the adLDAP library made a crucial function
protected, thus breaking the authad plugin.

This just makes the function public again, which should fix the
immeadiate problem. A proper fix would need to do #1553 as well

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preg_replace /e modifier replaced by preg_replace_callback

See #1551

crlf 2 lf whitespace fixes

moved adLDAP to authad plugin and fixed includes