dropped messages

[Carl Bruecken]

 With current implementation, it's impossible to tell from logs what 
the message types (verb) were dropped.  I read this was changed for 
spamming, but I think the behavior should be configurable, either 
aggregate counts of dropped messages or log individual occurrences with 
the message verb.

One suggestion is to pass message into 
MessagingService.incrementDroppedMessages and have a configuration item 
or system property indicate the behavior.