ISPN-2836 org.jgroups.TimeoutException after invoking MapCombineCommand ...

...in Map/Reduce task with 2 nodes

https://issues.jboss.org/browse/ISPN-2836

Since we have no control how long the map/reduce tasks can run, I've created a separate timeout for them (instead of using the replication timeout). 

ps. Sorry, I let IntelliJ to trim the lines in MapReduceManagerImpl. The only real modifications is some logging in the map/reduce phase duration times.