Removes a roster entry from the roster. The roster entry will also be removed from the unfiled entries or from any roster group where it could belong and will no longer be part of the roster. Note that this is an asynchronous call -- Smack must wait for the server to send an updated subscription status.
@param entry a roster entry.
@throws XMPPException if an XMPP error occurs.
@throws IllegalStateException if connection is not logged in or logged in anonymously
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