[PATCH] zabbix_agentd: Add IPFire services.get item

[Robin Roevens <robin.roevens@disroot.org>]

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Hi all,

This patch introduces again the ability for Zabbix to get information
about the running IPFire services. This functionality was already
submitted a long while ago but was rejected because the perl script behind
it contained the same 'ugly code' as services.cgi contained back then.
Meanwhile the code of services.cgi was updated by both me, adding more
generic addon services discovery using new pakfire functions, and more
recently by Michael with new general functions for finding pids and memory
consumption of services.

So I now refactored my services-discovery-perl-script, that will be used
by the zabbix-agent if the Zabbix server requests services information, 
to use the same methods as currently used in services.cgi, using those new 
functions, hoping that this feature now can be accepted into IPFire.


Note: I don't change the PAKVER in this patch, which should not be
needed if this patch is applyed shortly after my previous patch updating
zabbix_agentd to v6.0.33

Regards

Robin