I'm not sure how to answer your question. Gluu 3.1.4 ships with OpenDJ by default. We have deprecated OpenLDAP, but the Gluu Server still uses LDAP to store user claims.
You can release these attributes as normal using the "SAML/Trust Relationship" mechanism.
If your question is about how to handle a mis-match of attribute names between the SP and IDP, you may have to do some experimenting.
Normally SAML attributes are referenced by the SP using the SAML 2.0 URI for the attribute (not the name of the attribute). For example, see this screenshot