Centos 7/SNG7 Fix Yum Repos

sed -i 's/mirror.centos.org/vault.centos.org/g' /etc/yum.repos.d/CentOS-*.repo
sed -i 's/^#.*baseurl=http/baseurl=http/g' /etc/yum.repos.d/CentOS-*.repo
sed -i 's/^mirrorlist=http/#mirrorlist=http/g' /etc/yum.repos.d/CentOS-*.repo
yum clean all && yum makecache