Update Dockerfile
Update Dockerfile

update to 0.5.0
jefersonm/sandbox,jefersonm/sandbox,jefersonm/sandbox,jefersonm/sandbox,jefersonm/sandbox,jefersonm/sandbox,CenturyLinkLabs/ctlc-docker-serf-members,jefersonm/sandbox,CenturyLinkLabs/docker-serf,jefersonm/sandbox,jefersonm/sandbox,jefersonm/sandbox