This patch will kill processes that are listening on any port/UNIX
socket within the namespace to be cleaned up. To kill them it will
issue a SIGTERM to them (or to their parents if they were forked) and,
if they don't die after a few seconds, a SIGKILL to them and all their
children.
This is intended for those cases when there's no specific cleanup and
serves as a fallback method.
Change-Id: I4195f633ef4a1788496d1293846f19eef89416aa
Partial-Bug: #1403455
Rodolfo Alonso Hernandez