Plumb through the --stop-timeout signal handling

podman run/create have the ability to set the stop timeout flag.
We need to stop it in the database.

Also Allowing negative time for stop timeout makes no sense, so switching
to timeout of uint, allows user to specify huge timeout values.

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

Closes: #158
Approved by: TomSweeneyRedHat

libpod/sql_state_test.go

@@ -26,6 +26,7 @@ func getTestContainer(id, name, locksDir string) (*Container, error) {
 			Stdin:           true,
 			Labels:          make(map[string]string),
 			StopSignal:      0,
+			StopTimeout:     0,
 			CreatedTime:     time.Now(),
 		},
 		state: &containerRuntimeInfo{