9.6 0818 2019
1. Change src/device default H5_ALWAYS to H5_ONDEMAND.
2. Add stream=main and stream=sub for ONVIF and HIVISION SDK/DAHUA SDK.
3. Add stream select(main sub) in h5sconsole.
4. Add GetSrcWithoutDevice API to get all camera which added to h5s.
5. Add autoplay in pbconf for playback from device without call start() after connect().
6. Cloud mode support dynamic channel change.
7. Device SDK channel support cloud push.
8. Fix playback playtime callback can't work issue.
9. Add <GuardCmd>SetGuard</GuardCmd> for GB28181 alarm.
