handle shib attributes with multiple attribute values
use core.utils.AttributeProcessor
(?)
Within each CGI variable (see below), multiple attribute values are separated by a semicolon, and semicolons in values are escaped with a backslash. The data should be interpreted as UTF-8, which is a superset of ASCII.
see https://wiki.shibboleth.net/confluence/display/SP3/AttributeAccess
Edited by Stefan Hynek