added a pull script to easily fetch all pre-build docker VNFs from the public DockerHub
added a pull script to easily fetch all pre-build docker VNFs from the public DockerHub

edmaas/son-examples,mpeuster/son-examples,sonata-nfv/son-examples,mpeuster/son-examples,mpeuster/son-examples,edmaas/son-examples,edmaas/son-examples,mpeuster/son-examples,mpeuster/son-examples,edmaas/son-examples,edmaas/son-examples,sonata-nfv/son-examples,mpeuster/son-examples,mpeuster/son-examples,sonata-nfv/son-examples,edmaas/son-examples,sonata-nfv/son-examples,sonata-nfv/son-examples,sonata-nfv/son-examples,sonata-nfv/son-examples,sonata-nfv/son-examples,sonata-nfv/son-examples,edmaas/son-examples,edmaas/son-examples,mpeuster/son-examples