[SUREFIRE-1939] Build fails if java.home has <=2 path components

Removes an invalid test which passes a JDK or JRE home to a method which
expects the path to the Java executable. Therefore the invalid input
leads to an exception.

This closes #743

surefire-booter/src/test/java/org/apache/maven/surefire/booter/SystemUtilsTest.java

@@ -73,14 +73,6 @@ public void shouldParseProprietaryReleaseFile() throws IOException {
             assertThat(SystemUtils.isJava9AtLeast(path.getAbsolutePath())).isTrue();
         }
 
-        @Test
-        public void incorrectJdkPath() {
-            File jre = new File(System.getProperty("java.home"));
-            File jdk = jre.getParentFile();
-            File incorrect = jdk.getParentFile();
-            assertThat(SystemUtils.isJava9AtLeast(incorrect.getAbsolutePath())).isFalse();
-        }
-
         @Test
         public void shouldHaveJavaPath() {
             String javaPath = System.getProperty("java.home") + separator + "bin" + separator + "java";