libpod: use pasta Setup() over Setup2()

Setup2() calls Setup() so they are both the same thing, the idea was to
keep Setup2() around in c/common for a bit to avoid breaking changes
during our regular vendoring. Now just use Setup() so we can get rid of
Setup2() in c/common.

https://github.com/containers/common/pull/2136/commits/a7415c3eab4675a5b37dbee9d33833af5f2b086e

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/networking_pasta_linux.go

@@ -12,7 +12,7 @@ package libpod
 import "github.com/containers/common/libnetwork/pasta"
 
 func (r *Runtime) setupPasta(ctr *Container, netns string) error {
-	res, err := pasta.Setup2(&pasta.SetupOptions{
+	res, err := pasta.Setup(&pasta.SetupOptions{
 		Config:       r.config,
 		Netns:        netns,
 		Ports:        ctr.convertPortMappings(),