Add a script that sets up Docker networking and starts the net-tools
Docker container. If successful, run Zephyr with native_posix and
execute the appropriate net-tools container executable. The proper
net-tools executable and arguments is selected depending on the
basename of the sample directory. This script needs to be updated
if the net-tools Docker image is updated in some incompatible way.
The net-tools directory is assumed to exist at the same level as
the Zephyr base directory, but its location can be set using the
'-N' command line argument. Likewise, '-Z' sets the Zephyr top level
directory.
When stopping Zephyr, go through all child processes since running a
native posix or other variant of Zephyr may cause a hierarchy of
processes to be created.
Fixes: #19540
Signed-off-by: Patrik Flykt <patrik.flykt@intel.com>
