Update Major Version test to remove 8.0 test cases on 7.x

Author: jbaiera

mr/src/test/java/org/elasticsearch/hadoop/util/EsMajorVersionTest.java

@@ -63,12 +63,6 @@ public class EsMajorVersionTest {
         versions.add("7.0.0");
         versions.add("7.1.0");
         versions.add("7.1.1");
-        versions.add("8.0.0-alpha1");
-        versions.add("8.0.0-beta2");
-        versions.add("8.0.0-rc3");
-        versions.add("8.0.0");
-        versions.add("8.1.0");
-        versions.add("8.1.1");
         TEST_VERSIONS = Collections.unmodifiableList(versions);
     }