Significantly simplified SAML Attribute handling.
Significantly simplified SAML Attribute handling.

It turns out that the ESGF AttributeService doesn't use the groupRole type any more.
Attributes are just name/value pairs so we can do away with FriendlyName and URNs.

sterlingbaldwin/esgf-pyclient,stephenpascoe/esgf-pyclient,bird-house/esgf-pyclient,ESGF/esgf-pyclient