Add Server.Version and cmd/client test code

Signed-off-by: Haiyan Meng <hmeng@redhat.com>

server/utils.go

@@ -0,0 +1,27 @@
+package server
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"runtime"
+)
+
+func getGPRCVersion() (string, error) {
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		return "", errors.New("Failed to recover the caller information.")
+	}
+
+	ocidRoot := filepath.Dir(filepath.Dir(file))
+	p := filepath.Join(ocidRoot, "Godeps/Godeps.json")
+
+	grepCmd := fmt.Sprintf(`grep -r "\"google.golang.org/grpc\"" %s -A 1 | grep "\"Rev\"" | cut -d: -f2 | tr -d ' "\n'`, p)
+
+	out, err := execCmd("bash", "-c", grepCmd)
+	if err != nil {
+		return "", err
+	}
+
+	return out, err
+}