code: public String getProperty(String name) {
          String value = properties.getProperty(name);
          return value != null ? value : System.getProperty(name);
      }
docs: Returns the value for a named property. If it has not been previously
  set, it will try to get the value from the system properties.
  
  @param name property name
  @return property value
  @see #setProperty(String, String)
  @see <a href="http://docs.hazelcast.org/docs/latest/manual/html-single/index.html#system-properties">
  Hazelcast System Properties</a>