Remove usage of pkg sockets and tlsconfig.

- Use the ones provided by docker/go-connections, they are a drop in replacement.
- Remove pkg/sockets from docker.
- Keep pkg/tlsconfig because libnetwork still needs it and there is a
  circular dependency issue.

Signed-off-by: David Calavera <david.calavera@gmail.com>
Upstream-commit: 9683297348
Component: cli

components/cli/common.go

@@ -2,7 +2,7 @@ package cli
 
 import (
 	flag "github.com/docker/docker/pkg/mflag"
-	"github.com/docker/docker/pkg/tlsconfig"
+	"github.com/docker/go-connections/tlsconfig"
 )
 
 // CommonFlags represents flags that are common to both the client and the daemon.