Use 'givenName' and 'sn' for first name and last name in LDAP auth backend instead of splitting 'cn'.
Use 'givenName' and 'sn' for first name and last name in LDAP auth backend
instead of splitting 'cn'.

In cases where users 'cn' didn't have a space, our LDAP authentication backend
was blowing up.  The standard schema uses 'givenName' for the first name and
'sn' (surname) for the last name, so we can just use that.



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