Allow users to expose ports from the pod to the host

we need to allow users to expose ports to the host for the purposes
of networking, like a webserver.  the port exposure must be done at
the time the pod is created.

strictly speaking, the port exposure occurs on the infra container.

Signed-off-by: baude <bbaude@redhat.com>

libpod/pod.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"github.com/containers/storage"
+	"github.com/cri-o/ocicni/pkg/ocicni"
 	"github.com/pkg/errors"
 )
 
@@ -96,7 +97,8 @@ type PodContainerInfo struct {
 
 // InfraContainerConfig is the configuration for the pod's infra container
 type InfraContainerConfig struct {
-	HasInfraContainer bool `json:"makeInfraContainer"`
+	HasInfraContainer bool                 `json:"makeInfraContainer"`
+	PortBindings      []ocicni.PortMapping `json:"infraPortBindings"`
 }
 
 // ID retrieves the pod's ID