changed test value for hostname

src/test/java/kieker/analysis/plugin/filter/sink/CPUUtilizationDisplayFilterTest.java

@@ -30,7 +30,7 @@ public class CPUUtilizationDisplayFilterTest {
 
 	// Record data
 	private final long timestamp = 1L;
-	private final String hostname = "hostname";
+	private final String hostname = "test_host";
 	private final String cpuID = "cpu_1";
 	private final double user = 2.0;
 	private final double system = 3.0;