Fix KerberosAuthenticationIT tests

Author: kvanerum

x-pack/qa/kerberos-tests/src/javaRestTest/java/org/elasticsearch/xpack/security/authc/kerberos/KerberosAuthenticationIT.java

@@ -142,7 +142,7 @@ public void setupRoleMapping() throws IOException {
 
     public void testLoginByKeytab() throws IOException, PrivilegedActionException {
         final String keytabPath = krb5Fixture.getKeytab().toString();
-        final boolean enabledDebugLogs = Booleans.parseBoolean(ENABLE_KERBEROS_DEBUG_LOGS_KEY);
+        final boolean enabledDebugLogs = Booleans.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY), false);
         final SpnegoHttpClientConfigCallbackHandler callbackHandler = new SpnegoHttpClientConfigCallbackHandler(
             krb5Fixture.getPrincipal(),
             keytabPath,
@@ -154,7 +154,7 @@ public void testLoginByKeytab() throws IOException, PrivilegedActionException {
     public void testLoginByUsernamePassword() throws IOException, PrivilegedActionException {
         final String userPrincipalName = TEST_USER_WITH_PWD_KEY;
         final String password = TEST_USER_WITH_PWD_PASSWD_KEY;
-        final boolean enabledDebugLogs = Booleans.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY));
+        final boolean enabledDebugLogs = Booleans.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY), false);
         final SpnegoHttpClientConfigCallbackHandler callbackHandler = new SpnegoHttpClientConfigCallbackHandler(
             userPrincipalName,
             new SecureString(password.toCharArray()),
@@ -166,7 +166,7 @@ public void testLoginByUsernamePassword() throws IOException, PrivilegedActionEx
     public void testGetOauth2TokenInExchangeForKerberosTickets() throws PrivilegedActionException, GSSException, IOException {
         final String userPrincipalName = TEST_USER_WITH_PWD_KEY;
         final String password = TEST_USER_WITH_PWD_PASSWD_KEY;
-        final boolean enabledDebugLogs = Booleans.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY));
+        final boolean enabledDebugLogs = Booleans.parseBoolean(System.getProperty(ENABLE_KERBEROS_DEBUG_LOGS_KEY), false);
         final SpnegoHttpClientConfigCallbackHandler callbackHandler = new SpnegoHttpClientConfigCallbackHandler(
             userPrincipalName,
             new SecureString(password.toCharArray()),