[issue2551217] Allow roundup to use setproctitle if setproctitle package installed.

New submission from John Rouillard:

Allow a user to set a title for the process in the process tree.

Useful for finding a specific roundup-server process rather than looking through all
the python processes for the one that needs killing.

1) add -P <processname> to roundup-server
2) if setproctitle not installed exit with error
3) if installed call it after uid switched to normal user so setproctitle not called as root.

for roundup.cgi:

1) if env variable ROUNDUP_PROCESS_NAME is set, and secproctitle installed,
   call setproctitle with that name
2) if setproctitle not installed, just continue.

I think these are the only two frontends that can benefit from this. wsgi and zope
IIUC are both run by a parent process in an embedded interpreter. For wsi gunicorn the
--name option lets you name the process.

----------
components: Web interface
keywords: Effort-Low, StarterTicket
messages: 7606
nosy: rouilj
priority: low
severity: minor
status: new
title: Allow roundup to use setproctitle if setproctitle package installed.
type: behavior

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<https://issues.roundup-tracker.org/issue2551217>
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