ref(test): update go version to 1.4.2

Author: aledbf

tests/fixtures/test-etcd/Dockerfile

@@ -11,7 +11,7 @@ RUN curl -sSL -o /usr/local/bin/etcdctl https://s3-us-west-2.amazonaws.com/opdem
 RUN buildDeps='curl git-core'; \
     set -x; \
     apt-get update && apt-get install -y $buildDeps --no-install-recommends \
-    && curl -sSL https://storage.googleapis.com/golang/go1.4.1.linux-amd64.tar.gz | tar -C /usr/local -xz \
+    && curl -sSL https://storage.googleapis.com/golang/go1.4.2.linux-amd64.tar.gz | tar -C /usr/local -xz \
     && git clone -q https://github.com/coreos/etcd.git /opt/etcd \
     && cd /opt/etcd && git checkout -q v0.4.6 && PATH=/usr/local/go/bin:$PATH ./build \
     && cp /opt/etcd/bin/etcd /usr/local/bin \