FieldNotFound when Logon without HeartBtInt is received - message is ignored

problem

When an Acceptor receives a Logon message that has not HeartBtInt set, there is a FieldNotFoundException thrown and the message is silently ignored.

We should reject the message with a Logout message and a meaningful error description. This should also apply when Exceptions of type IncorrectDataFormat or IncorrectTagValue are thrown.