backport the ustreamer deb from impish to focal

[hugh chao]

[Impact]

 Due to the target image for internal project(remote enhancement project)
 - zapper[0] is 20.04,
 and currently the video stream package - ustreamer is only on hirsute and
 impish [1],
 this package is necessary for us to stream the remote video to local,
 so need to back the package into 20.04

[Test Plan]
- Install the package through
  - sudo apt install ustreamer
- Launch the application
  - ustreamer --device=/dev/video<0-9> --host=<ip> --port=8080
  - try live stream on the webpage as <ip>:8080

[Where problems could occur]
Seems we don't have this package in focal right now,
and it definitely an independence package, so I don't think there is any
problem.

[Other Info]

 * PPA: https://launchpad.net/~hugh712/+archive/ubuntu/sru-1929260

[0] https://launchpad.net/zapper
[1] https://packages.ubuntu.com/search?keywords=ustreamer

[Yuan-Chen Cheng (ycheng-twn)]

version in focal/ppa 3.16-1ubuntu2 is greater than the hirsute / impish version 3.16-1ubuntu1 and that will make the upgrade failed.

maybe something like 3.16-1ubuntu1~focal1 shall work.

[hugh chao (hugh712)]

sure, will do.

[hugh chao (hugh712)]

upload the debdiff

[Rex Tsai (chihchun)]

This component will be only used for an internal project, does not need to be ported to focal. Would love to see it in 22.04

[Sebastien Bacher (seb128)]

Setting to wontfix accoding to Rex's comment but feel free to reopen if that's a misunderstanding