Added unsupported implementations for sandbox and sandbox

test code

Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>

libnetwork/sandbox/sandbox_unsupported.go

@@ -0,0 +1,15 @@
+// +build !linux
+
+package sandbox
+
+import "errors"
+
+var (
+	ErrNotImplemented = errors.New("not implemented")
+)
+
+// NewSandbox provides a new sandbox instance created in an os specific way
+// provided a key which uniquely identifies the sandbox
+func NewSandbox(key string) (Sandbox, error) {
+	return nil, ErrNotImplemented
+}

libnetwork/sandbox/sandbox_unsupported_test.go

@@ -0,0 +1,20 @@
+// +build !linux
+
+package sandbox
+
+import (
+	"errors"
+	"testing"
+)
+
+var (
+	ErrNotImplemented = errors.New("not implemented")
+)
+
+func newKey(t *testing.T) (string, error) {
+	return nil, ErrNotImplemented
+}
+
+func verifySandbox(t *testing.T, s Sandbox) {
+	return
+}