Comment 2 for bug 1732962

So the situation is:

- We need to keep the argument count at 5-6 no matter what, otherwise old containers in new hosts break
- In containers, we do not parse any arguments except for 5.
- The core_pattern is defined on the host.

I suggest we just split the command-line by "," as well. So if we have

--pid=%p --signal=%s --core-size=%c --dump-mode=%d %P

we can extend that to

--pid=%p --signal=%s --core-size=%c --dump-mode=%d,foo-bar=%d %P

or we just drop the -- alltogether:

pid=%p signal=%s core-size=%c dump-mode=%d,foo-bar=%? %P

That should work:

host=old, container=old => everything as before
host=old, container=new => core_pattern as before, no effective changes
host=new, container=old => new core_pattern, container just forwards to host, host does parsing
host=new, container=new => fine too