- This change fix a bug that was preventing dynamic configuration of SSL with JMX
to work because JmxConnectionHandler.configAddIsAcceptable(ConfigEntry, StringBuilder)
performs a wrong check on the DN of the added object.

- This fix also ease the coding of the unit test of JMX by allowing to configure
the key manager by creating a configEntry and calling directly the applyConfigurationAdd()
method.
This was not possible because the code looks for the config entry in the configuration