Add 2 runtime configs for Motion
Add 2 runtime configs for Motion

1) MOTION_THRESHOLD for threshold
2) MOTION_EVENT_GAP for event_gap

Signed-off-by: kfei <1da1ad03e627cea4baf20871022464fcc6a4b2c4@kfei.net>

kfei/dockmotion,jshridha/docker-motion,jshridha/docker-motioneye,dcmartin/AgeAtHome,dcmartin/AgeAtHome,dcmartin/AgeAtHome,dcmartin/AgeAtHome,dcmartin/AgeAtHome