SLIDER-622 simplify check for kill by just disabling it on windows test runs
diff --git a/slider-core/src/test/groovy/org/apache/slider/test/YarnMiniClusterTestBase.groovy b/slider-core/src/test/groovy/org/apache/slider/test/YarnMiniClusterTestBase.groovy
index 88fac06..96b1aae 100644
--- a/slider-core/src/test/groovy/org/apache/slider/test/YarnMiniClusterTestBase.groovy
+++ b/slider-core/src/test/groovy/org/apache/slider/test/YarnMiniClusterTestBase.groovy
@@ -210,11 +210,7 @@
    */
   @BeforeClass 
   public static void checkKillSupport() {
-    if (!Shell.WINDOWS) {
-      kill_supported = true;
-    } else {
-      kill_supported = doesWindowsAppExist(["xargs", "--version"])
-    }
+    kill_supported = !Shell.WINDOWS
   }
 
   /**