Remove non needed import

Author: dadoonet

plugins/discovery-ec2/src/test/java/org/elasticsearch/discovery/ec2/Ec2DiscoveryTests.java

@@ -52,7 +52,6 @@
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.hasSize;
 import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.isOneOf;
 
 public class Ec2DiscoveryTests extends ESTestCase {