Handle multivalued fields in roles filters

[jusabatier]

This allow to handle multivalued fields in roles assignation filters.

For example this filter will work correctly :

role1|(CAS{memberOf} -CONTAINS "cn=ROLE1")

Form this response XML :

<cas:serviceResponse xmlns:cas='http://www.yale.edu/tp/cas'>
    <cas:authenticationSuccess>
        <cas:user>tuser</cas:user>
        <cas:attributes>
            <cas:isFromNewLogin>true</cas:isFromNewLogin>
            <cas:mail>test@test.fr</cas:mail>
            <cas:authenticationDate>2021-04-27T10:33:52.006071Z</cas:authenticationDate>
            <cas:givenName>Test</cas:givenName>
            <cas:successfulAuthenticationHandlers>LdapAuthenticationHandler</cas:successfulAuthenticationHandlers>
            <cas:cn>Test User</cas:cn>
            <cas:credentialType>UsernamePasswordCredential</cas:credentialType>
            <cas:uid>tuser</cas:uid>
            <cas:authenticationMethod>LdapAuthenticationHandler</cas:authenticationMethod>
            <cas:longTermAuthenticationRequestTokenUsed>false</cas:longTermAuthenticationRequestTokenUsed>
            <cas:memberOf>cn=USER,ou=roles,dc=lepuyenvelay,dc=fr</cas:memberOf>
            <cas:memberOf>cn=TEST1,ou=roles,dc=lepuyenvelay,dc=fr</cas:memberOf>
            <cas:sn>User</cas:sn>
            </cas:attributes>
    </cas:authenticationSuccess>
</cas:serviceResponse>