This fix tries to address the issue raised in #21976 and allows
the options of `--add-host` and `--net=host` to work at the same time.
The documentation has been updated and additional tests have been
added to cover this change.
This fix fixes#21976.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 90bd41a74d57080711678bffa2bc4371020ee3a5
Component: engine