def hosts
      @hosts ||= begin
                   hosts = ENV['ROUTEMASTER_DRAIN_HOSTS'].split(',')
                   hosts.inject({}) do |res, host|
                     key, val = host.split(':')
                     res.merge(key => val)
                   end
                 end
    end
def hosts
      @hosts ||= begin
                   hosts = ENV['ROUTEMASTER_DRAIN_HOSTS'].split(',')
                   hosts.inject({}) do |res, host|
                     key, val = host.split(':')
                     res.merge(key => val)
                   end
                 end
    end
Given an ENV format of service:service_root_url,other_service:other_service_root_url
 Generate a hash of { service => service_root_url, other_service => other_service_root_url }