Fix: Downgrade fluent-plugin-ec2-metadata to 0.0.15
Fix: Downgrade fluent-plugin-ec2-metadata to 0.0.15

0.0.16 isn't on the gem repositories yet.

Un-Breaks #658

tinnightcap/nubis-base,limed/nubis-base,tinnightcap/nubis-base,limed/nubis-base,Nubisproject/nubis-base,gozer/nubis-base,Nubisproject/nubis-base,tinnightcap/nubis-base,limed/nubis-base,gozer/nubis-base,gozer/nubis-base