VOL-1558 Update vendored voltha-go and other items

Result of running dep ensure.  golang openolt now
builds.

Also update dockerfile to used specific alpine version

Change-Id: I1e5407e25bb0636a241a0650d1e44e5df567f44b
diff --git a/vendor/github.com/gyuho/goraph/test b/vendor/github.com/gyuho/goraph/test
new file mode 100755
index 0000000..a7d8a6d
--- /dev/null
+++ b/vendor/github.com/gyuho/goraph/test
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+TEST=./...;
+FMT="*.go"
+
+echo "Running tests...";
+go test -v -cover -cpu 1,2,4 $TEST;
+go test -v -cover -cpu 1,2,4 -race $TEST;
+
+echo "Checking gofmt..."
+fmtRes=$(gofmt -l -s $FMT)
+if [ -n "${fmtRes}" ]; then
+	echo -e "gofmt checking failed:\n${fmtRes}"
+	exit 255
+fi
+
+echo "Checking govet..."
+vetRes=$(go vet $TEST)
+if [ -n "${vetRes}" ]; then
+	echo -e "govet checking failed:\n${vetRes}"
+	exit 255
+fi
+
+echo "Success";