Remove unused import

Author: Demogorgon314

pulsar-broker/src/main/java/org/apache/pulsar/broker/web/PulsarWebResource.java

@@ -45,7 +45,6 @@
 import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.container.AsyncResponse;
 import javax.ws.rs.core.Context;
-import javax.ws.rs.core.MultivaluedMap;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.Status;
 import javax.ws.rs.core.UriBuilder;