ppc64le: update dockerfile golang dl link

updates golang download link to be consistent with other dockerfiles

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

Dockerfile.ppc64le

@@ -93,7 +93,7 @@ RUN set -x \
 # to build go from source.
 # NOTE: ppc64le has compatibility issues with older versions of go, so make sure the version >= 1.6
 ENV GO_VERSION 1.7.1
-ENV GO_DOWNLOAD_URL https://golang.org/dl/go${GO_VERSION}.src.tar.gz
+ENV GO_DOWNLOAD_URL https://storage.googleapis.com/golang/go${GO_VERSION}.src.tar.gz
 
 RUN set -x \
 	&& TEMPDIR="$(mktemp -d)" \