Allow explicit configuration of TTRPC address

Previously the TTRPC address was generated as "<GRPC address>.ttrpc".
This change now allows explicit configuration of the TTRPC address, with
the default still being the old format if no value is specified.

As part of this change, a new configuration section is added for TTRPC
listener options.

Signed-off-by: Kevin Parsons <kevpar@microsoft.com>

runtime/v2/shim/util.go

@@ -38,7 +38,7 @@ import (
 var runtimePaths sync.Map
 
 // Command returns the shim command with the provided args and configuration
-func Command(ctx context.Context, runtime, containerdAddress, path string, opts *types.Any, cmdArgs ...string) (*exec.Cmd, error) {
+func Command(ctx context.Context, runtime, containerdAddress, containerdTTRPCAddress, path string, opts *types.Any, cmdArgs ...string) (*exec.Cmd, error) {
 	ns, err := namespaces.NamespaceRequired(ctx)
 	if err != nil {
 		return nil, err
@@ -50,6 +50,7 @@ func Command(ctx context.Context, runtime, containerdAddress, path string, opts
 	args := []string{
 		"-namespace", ns,
 		"-address", containerdAddress,
+		"-ttrpc-address", containerdTTRPCAddress,
 		"-publish-binary", self,
 	}
 	args = append(args, cmdArgs...)