Address review comments and add ability to save Map/Reduce results in
cache

Modify MapReduceStage to support setting maxCollectorSize and handle
storing the results in a new cache
Add "touch radargun.log" to master.sh to avoid failures when using the
"-t" option
Upadate the XSD file
Update the plugin.properties files for the jdg62/3 plugins
Add an Infinispan70CacheInfo class that uses a distributed iterator to
get th total size of a distributed cache. (This class can also be used
with the jdg63 plugin when the next ER is released.)