added ability to remove a property (for test cases)

Former-commit-id: 68d7bca4bcbc7241f3f31e669dcae78ac62319bb

dependency-check-core/src/main/java/org/owasp/dependencycheck/utils/Settings.java

@@ -309,6 +309,16 @@ public final class Settings {
         return System.getProperty(key, INSTANCE.props.getProperty(key));
     }
 
+    /**
+     * Removes a property from the local properties collection. This is mainly
+     * used in test cases.
+     *
+     * @param key the property key to remove
+     */
+    public static void removeProperty(String key) {
+        INSTANCE.props.remove(key);
+    }
+
     /**
      * Returns an int value from the properties file. If the value was specified
      * as a system property or passed in via the -Dprop=value argument - this