[VOL-2193] Create mocks for Kafka Client and Etcd

This commit consists of:
1) A kafka client mock that implements the kafka client interface
under voltha-lib-go/pkg/kafka/client.go
2) An embedded Etcd server that runs in-process and represents an
Etcd server.

Change-Id: I52a36132568e08c596bb4136918bebcb654a3b99
diff --git a/vendor/golang.org/x/sys/windows/asm_windows_386.s b/vendor/golang.org/x/sys/windows/asm_windows_386.s
new file mode 100644
index 0000000..21d994d
--- /dev/null
+++ b/vendor/golang.org/x/sys/windows/asm_windows_386.s
@@ -0,0 +1,13 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//
+// System calls for 386, Windows are implemented in runtime/syscall_windows.goc
+//
+
+TEXT ·getprocaddress(SB), 7, $0-16
+	JMP	syscall·getprocaddress(SB)
+
+TEXT ·loadlibrary(SB), 7, $0-12
+	JMP	syscall·loadlibrary(SB)