Removing epel-release install

Author: subnetmarco

Dockerfile

@@ -3,8 +3,7 @@ MAINTAINER Marco Palladino, marco@mashape.com
 
 ENV KONG_VERSION 0.8.3
 
-RUN yum install -y epel-release && \
- yum install -y https://github.com/Mashape/kong/releases/download/$KONG_VERSION/kong-$KONG_VERSION.el7.noarch.rpm && \
+RUN yum install -y https://github.com/Mashape/kong/releases/download/$KONG_VERSION/kong-$KONG_VERSION.el7.noarch.rpm && \
  yum clean all
 
 COPY config.docker/kong.yml /etc/kong/