Add more stats to the MySQLCollector
Add more stats to the MySQLCollector

Now the collector produces on demand stats about:
    * Innodb rollback segments
    * Processlist idle threads and long queries
    * Temp table sizes on disk

tsheasha/fullerite,mikepea/fullerite,Yelp/fullerite,venkey-ariv/fullerite,Yelp/fullerite,tsheasha/fullerite,baris/fullerite,Yelp/fullerite,baris/fullerite,mikepea/fullerite,tsheasha/fullerite,Yelp/fullerite,mikepea/fullerite,venkey-ariv/fullerite,tsheasha/fullerite,baris/fullerite,venkey-ariv/fullerite,venkey-ariv/fullerite,baris/fullerite,mikepea/fullerite