ipv4 only for Yum in AWS. also fix typo.
ipv4 only for Yum in AWS. also fix typo.

peterbe/socorro-infra,rhelmer/socorro-infra,mozilla/socorro-infra,phrawzty/socorro-infra,mozilla/socorro-infra,peterbe/socorro-infra,phrawzty/socorro-infra,peterbe/socorro-infra,jdotpz/socorro-infra,jdotpz/socorro-infra,rhelmer/socorro-infra,phrawzty/socorro-infra,mozilla/socorro-infra,rhelmer/socorro-infra