Add event logging to libpod, even display to podman

In lipod, we now log major events that occurr.  These events
can be displayed using the `podman events` command. Each
event contains:

* Type (container, image, volume, pod...)
* Status (create, rm, stop, kill, ....)
* Timestamp in RFC3339Nano format
* Name (if applicable)
* Image (if applicable)

The format of the event and the varlink endpoint are to not
be considered stable until cockpit has done its enablement.

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

libpod/runtime_pod_linux.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/containerd/cgroups"
+	"github.com/containers/libpod/libpod/events"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -121,7 +122,7 @@ func (r *Runtime) NewPod(ctx context.Context, options ...PodCreateOption) (*Pod,
 			return nil, err
 		}
 	}
-
+	pod.newPodEvent(events.Create)
 	return pod, nil
 }
 
@@ -307,6 +308,6 @@ func (r *Runtime) removePod(ctx context.Context, p *Pod, removeCtrs, force bool)
 
 	// Mark pod invalid
 	p.valid = false
-
+	p.newPodEvent(events.Remove)
 	return nil
 }