set remotePoll:true for fast remote polling.  -phil

using fast remote polling restricts some options - "If you want to use this, you can have only one repository with one branch (no wildcards!), and you can not use any excluded regions, excluded users or submodules, otherwise this option will disable itself after save. " (git advanced text in Jenkins itself) - but the alternative is to have all git jobs trigger spurious rebuilds whenever their slaves go offline which is a bigger pain at this point.