libnetwork/pasta: use options from containers.conf

Read pasta_options from containers.conf and set the arguments based on
that. The options that were set on the cli will appended after that so
it allows some form of overwrites.

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

common/libnetwork/pasta/pasta.go

@@ -83,6 +83,9 @@ func Setup(opts *SetupOptions) error {
 		}
 	}
 
+	// first append options set in the config
+	cmdArgs = append(cmdArgs, opts.Config.Network.PastaOptions...)
+	// then append the ones that were set on the cli
 	cmdArgs = append(cmdArgs, opts.ExtraOptions...)
 
 	for i, opt := range cmdArgs {