OF-805 [MUC] OF does not return all affiliated users when requesting multiple affiliations

When requesting:
<iq type="get" to="6ace0fd2f59f13c2484336dd06b4462a@bizmanager.msz006" id="getRoomMemberList">
<query xmlns="http://jabber.org/protocol/muc#admin">
<item affiliation="member"/>
<item affiliation="owner"/>
<item affiliation="admin"/>
</query>
</iq>

Openfire does only return admins (the last requested affiliation).
This fix rectifies this.
Merge pull request #41 from sco0ter/of805

OF-805 [MUC] OF does not return all affiliated users when requesting mul...