Add support for retry count with --restart flag

The on-failure restart option supports restarting only a given
number of times. To do this, we need one additional field in the
DB to track restart count (which conveniently fills a field in
Inspect we weren't populating), plus some plumbing logic.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

libpod/container_inspect.go

@@ -95,6 +95,7 @@ func (c *Container) getContainerInspectData(size bool, driverData *inspect.Data)
 		LogPath:         config.LogPath,
 		ConmonPidFile:   config.ConmonPidFile,
 		Name:            config.Name,
+		RestartCount:    int32(runtimeInfo.RestartCount),
 		Driver:          driverData.Name,
 		MountLabel:      config.MountLabel,
 		ProcessLabel:    config.ProcessLabel,