Change CRI config runtime options type

Changing Runtime.Options type to map[string]interface{}
to correctly marshal it from go to JSON.
See issue: https://github.com/kubernetes-sigs/cri-tools/issues/728

Signed-off-by: Aditi Sharma <adi.sky17@gmail.com>

pkg/cri/server/helpers.go

@@ -32,6 +32,7 @@ import (
 	runcoptions "github.com/containerd/containerd/runtime/v2/runc/options"
 	"github.com/containerd/typeurl"
 	imagedigest "github.com/opencontainers/go-digest"
+	"github.com/pelletier/go-toml"
 	"github.com/pkg/errors"
 	"golang.org/x/net/context"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
@@ -308,8 +309,12 @@ func generateRuntimeOptions(r criconfig.Runtime, c criconfig.Config) (interface{
 			SystemdCgroup: c.SystemdCgroup,
 		}, nil
 	}
+	optionsTree, err := toml.TreeFromMap(r.Options)
+	if err != nil {
+		return nil, err
+	}
 	options := getRuntimeOptionsType(r.Type)
-	if err := r.Options.Unmarshal(options); err != nil {
+	if err := optionsTree.Unmarshal(options); err != nil {
 		return nil, err
 	}
 	return options, nil