validate:launcher: Show timeout seconds for timeout result message

validate:launcher: Show timeout seconds for timeout result message

Current timeout message doesn't show how many seconds a test took and
it is timeouted by normal timeout or hard timeout.

This patch changes the message like following.

1. normal timeout
old : validate.http.playback.reverse_playback.raw_video_mov: Timeout (Application timed out)
new : validate.http.playback.reverse_playback.raw_video_mov: Timeout (Application timed out: 120 secs)

2. hard timeout
old : validate.http.playback.reverse_playback.raw_video_mov: Timeout (Application timed out)
new : validate.http.playback.reverse_playback.raw_video_mov: Timeout (Hard timeout reached: 600 secs)

https://bugzilla.gnome.org/show_bug.cgi?id=746957