HADOOP-15293. TestLogLevel fails on Java 9

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 99ab511cbac570bea9d31a55898b95590a8e3159)

 Conflicts:
	hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/log/TestLogLevel.java

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/log/TestLogLevel.java

@@ -356,7 +356,7 @@ public class TestLogLevel extends KerberosSecurityTestcase {
       fail("A HTTPS Client should not have succeeded in connecting to a " +
           "HTTP server");
     } catch (SSLException e) {
-      GenericTestUtils.assertExceptionContains("Unrecognized SSL message", e);
+      GenericTestUtils.assertExceptionContains("recognized SSL message", e);
     }
   }
 
@@ -374,7 +374,7 @@ public class TestLogLevel extends KerberosSecurityTestcase {
       fail("A HTTPS Client should not have succeeded in connecting to a " +
           "HTTP server");
     } catch (SSLException e) {
-      GenericTestUtils.assertExceptionContains("Unrecognized SSL message", e);
+      GenericTestUtils.assertExceptionContains("recognized SSL message", e);
     }
   }