[PATCH v3 0/5] zabbix_agentd: Update to v5.0.20 (LTS) and more

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

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Hi all

A new take on updating current zabbix_agentd 4.2.6 to latest LTS
version. This set updates the agent version, fixes a few problems with
the original addon and adds a few ipfire-specific metrics for
the user to monitor out of the box (which I will document on the wiki
when the patch-set is accepted).

The differences with the previous patch submission are:
- patch 1: update to v5.0.20
- patch 2: 
  - In the previous version the correct modules dir was commented
    out in the rootfile and was manually removed in the uninstall script if
    it was not empty. But since it is also included in the backup I figured
    it can be removed always by remove_files so I kept it in the rootfile
    now.
  - Checks before creating dirs are added in install script to see if
    dir is not already existing (like most other addons seem to do)
  - Function extract_backup_includes was not called in update.sh script
    causing possible scenarios where those includes are not present when
    backup needs to be taken or restored.
- patch 3: Made sure to remove all configfiles upon uninstall as
  everything is in the backup. Also made sure that the ipfire supplied
  userparameter_pakfire.conf file is not added in addon-backup hence
  correctly updated on pak update.
- patch 4: Is a small new patch to default the zabbix agent to listen
  only on GREEN as that is probably where the user's Zabbix server is
  and is a safer default than listening on all interfaces.
- patch 5: was formerly patch4. 
  - Grouped all ipfire (non-pakfire) related metrics in a single config
    file for simplicity.
  - Replaced the previous problematic iptables related metric and sudo 
    rights with the renewed and safer getipstats binary.
  - Removed the services related metrics and perl script for now as we
    first need to have the new services metadata in the pak's and
    related pakfire functions so that I don't need to copy the bad code
    from services.cgi as I did before.
  - Added 2 new metrics: number of active dhcp leases and number of
    captive portal users. Those where contributed by StackKorora on
    my Zabbix template for IPFire on github.

As it was almost a year ago, previous patch submission and discussion
can be found here: 
https://lists.ipfire.org/pipermail/development/2021-April/009872.html

I hope I addressed all concerns there where on the previous submission.

Regards
Robin



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