Removed bad import that snuck in

Author: Matt Jacobs

hystrix-core/src/test/java/com/netflix/hystrix/HystrixCommandTest.java

@@ -29,7 +29,6 @@
 import com.netflix.hystrix.strategy.concurrency.HystrixRequestContext;
 import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
 import com.netflix.hystrix.strategy.properties.HystrixProperty;
-import com.sun.javafx.collections.NonIterableChange;
 import org.junit.After;
 import org.junit.Rule;
 import org.junit.Test;