Use the version of go for SLES container used in other OS's.

docker/Dockerfile_sles_12sp2

@@ -76,7 +76,7 @@ RUN curl -fsSL "https://www.kernel.org/pub/software/scm/git/git-${GIT_VERSION}.t
   && make install ; \
     rm -rf /tmp/git-${GIT_VERSION}
 
-ENV GO_VERSION 1.5.4
+ENV GO_VERSION 1.8.1
 RUN curl -fsSL "https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz" \
 	| tar -xzC /usr/local \
   && ln -sf /usr/local/go/bin/go /usr/local/go/bin/gofmt /usr/local/go/bin/godoc /usr/local/bin/