Implement kpod rm

Kpod rm removes a container from the system

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Signed-off-by: umohnani8 <umohnani@redhat.com>

libkpod/stop.go

@@ -0,0 +1,28 @@
+package libkpod
+
+import (
+	"github.com/kubernetes-incubator/cri-o/oci"
+	"github.com/pkg/errors"
+)
+
+// ContainerStop stops a running container with a grace period (i.e., timeout).
+func (c *ContainerServer) ContainerStop(container string, timeout int64) (string, error) {
+	ctr, err := c.LookupContainer(container)
+	if err != nil {
+		return "", errors.Wrapf(err, "failed to find container %s", container)
+	}
+
+	cStatus := c.runtime.ContainerStatus(ctr)
+	if cStatus.Status != oci.ContainerStateStopped {
+		if err := c.runtime.StopContainer(ctr, timeout); err != nil {
+			return "", errors.Wrapf(err, "failed to stop container %s", ctr.ID())
+		}
+		if err := c.storageRuntimeServer.StopContainer(ctr.ID()); err != nil {
+			return "", errors.Wrapf(err, "failed to unmount container %s", ctr.ID())
+		}
+	}
+
+	c.ContainerStateToDisk(ctr)
+
+	return ctr.ID(), nil
+}