Add 7.3.x branch mapping
Add 7.3.x branch mapping

drdaveg/droolsjbpm-build-bootstrap,ryanzhang/droolsjbpm-build-bootstrap,ryanzhang/droolsjbpm-build-bootstrap,drdaveg/droolsjbpm-build-bootstrap,droolsjbpm/droolsjbpm-build-bootstrap,kiereleaseuser/droolsjbpm-build-bootstrap,porcelli-forks/droolsjbpm-build-bootstrap,porcelli-forks/droolsjbpm-build-bootstrap,droolsjbpm/droolsjbpm-build-bootstrap,kiereleaseuser/droolsjbpm-build-bootstrap