Add additional logging for vmci failures. Fixes #207

vmdk_plugin/vmdkops/esx_vmdkcmd.go

@@ -93,6 +93,9 @@ func (vmdkCmd EsxVmdkCmd) Run(cmd string, name string, opts map[string]string) (
 		msg := fmt.Sprintf("'%s' failed: %v (errno=%d).", cmd, err, int(errno))
 		if errno == syscall.ECONNRESET {
 			msg += " Check that ESX service is running."
+			msg += " Check vmware tools or open vm tools is installed."
+			msg += " Check vmci and vsock modules are loaded."
+			msg += " Check vsocket ports are the same between ESX service and plugin."
 		}
 		log.Warnf(msg)
 		return nil, errors.New(msg)