build/devops

[cw7k]

Hi, a full mvn install takes about 2-2.5 hours.  Does the Flink team run the 
full testsuite on every dev pull request, or use a main dev branch that gets 
the full test periodically?  Or a different method?  The 2 hours can be a drag 
when one team needs another's changes and each attempt at passing requires a 
wait of 2+ hours.