golang is not a requirement to package etcd RPM

The etcd release binaries at https://github.com/coreos/etcd/releases
are statically linked (by go's nature), the system doesn't require
golang to be installed.

Tested on Centos 6.5.
Fix date
Merge pull request #6 from NodePrime/remove_golang_dep

golang is not a requirement to package etcd RPM