console-watcher: use console watcher to monitor guest console outputs

Import new console watcher to monitor guest console outputs, and will be
only effective when we turn on enable_debug option.
Guest console outputs may include guest kernel debug info, agent debug info,
etc.

Fixes: #389

Signed-off-by: Penny Zheng penny.zheng@arm.com

src/runtime/virtcontainers/qemu_test.go

@@ -314,9 +314,10 @@ func TestQemuGetSandboxConsole(t *testing.T) {
 	sandboxID := "testSandboxID"
 	expected := filepath.Join(q.store.RunVMStoragePath(), sandboxID, consoleSocket)
 
-	result, err := q.getSandboxConsole(sandboxID)
+	proto, result, err := q.getSandboxConsole(sandboxID)
 	assert.NoError(err)
 	assert.Equal(result, expected)
+	assert.Equal(proto, consoleProtoUnix)
 }
 
 func TestQemuCapabilities(t *testing.T) {