commands: fix debug flag in standalone mode

The -D/--debug flag was not enabling debug logging in standalone mode.

Root cause: debug.Enable() was called before dockerCli.Initialize(),
but Initialize() calls SetLogLevel("") which resets logrus level to
Info, and since options.Debug was false, it wasn't re-enabled.

Fix: Pass opt.debug to options.Debug before Initialize() so it
properly enables debug level after SetLogLevel().

Signed-off-by: Sergei Khomenkov <sergey@homenkow.ru>

commands/root.go

@@ -57,6 +57,7 @@ func NewRootCmd(name string, isPlugin bool, dockerCli *command.DockerCli) *cobra
 				options := cliflags.NewClientOptions()
 				options.InstallFlags(nflags)
 				options.SetDefaultOptions(nflags)
+				options.Debug = opt.debug || debug.IsEnabled()
 				return dockerCli.Initialize(options)
 			}
 			return plugin.PersistentPreRunE(cmd, args)