[JENKINS][ANN] new ovirt-engine dao unitests gerrit job

fyi, i've added a new job [1] to run on each patch for ovirt-engine. the job runs dao-unit tests for ovirt-engine and it's run time is ~ 3 min. important reqs: 1. job requires postgres & a db installed. 2. job runs only run changes to: packaging/dbscripts/** backend/manager/modules/dal/** 3. runs on both master and ovirt-engine-3.3 branches 4. only runs 3 instances ins parallel for now 5. runs only on a specifc slave for now - requires adding puppet class for other slaves to ensure postgres. If you encounter any issues/problems, replay on the thread please. Eyal. [1] http://jenkins.ovirt.org/job/ovirt_engine_dao_unit_tests_gerrit/3/