Updated package schema for stringent validation of service name (#1275)
Updated package schema for stringent validation of service name (#1275)

* Updated package schema for stringent validation of service name

* Updated schema for supporting package names that are of two characters

AppliedIS/universe,mesosphere/universe,mwl/universe,yuchaoran2011/universe,BuoyantIO/universe,AppliedIS/universe,aloismayr/universe,madanadit/universe,mesosphere/universe,yuchaoran2011/universe,mwl/universe,dbtucker/universe,dbtucker/universe,BuoyantIO/universe,AppliedIS/universe,yuchaoran2011/universe,madanadit/universe,aloismayr/universe,BuoyantIO/universe,dbtucker/universe,aloismayr/universe,madanadit/universe