Merge pull request #992 from AdoptOpenJDK/fix_property_warning

fix warning for a config property validation

Author: janakmulani

core/src/main/java/net/sourceforge/jnlp/config/Defaults.java

@@ -597,6 +597,12 @@ public class Defaults {
                     ConfigurationConstants.KEY_HTTPCONNECTION_READ_TIMEOUT,
                     String.valueOf(10000),
                     ValidatorFactory.createRangedIntegerValidator(0, Integer.MAX_VALUE)
+            ),
+
+            Setting.createDefault(
+                    ConfigurationConstants.KEY_HTTPCONNECTION_REQUEST_INTERVAL,
+                    String.valueOf(0),
+                    ValidatorFactory.createRangedIntegerValidator(0, Integer.MAX_VALUE)
             )
     );