[bisq-network/bisq] Monitoring install scripts (#3985)

[Florian Reimair]

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Completes first part of #3916.

- cleans up the seednode install script
- install script for monitoring servers with collectd
- install script for the networksize metric

I tested the script for general monitoring using a fresh ubuntu 18.04 LTS installation. I could not test the script for the networksize metric as thoroughly, as there is no install script for a price node available yet.

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3985

-- Commit Summary --

  * Install script for collectd
  * Install script for network size metric

-- File Changes --

    A monitor/collectd.conf (136)
    A monitor/install_collectd_debian.sh (64)
    A monitor/nginx.conf (30)
    A monitor/uninstall_collectd_debian.sh (11)
    A pricenode/collectd.conf.snippet (5)
    A pricenode/install_networksize_debian.sh (43)
    A pricenode/journalscraper.sh (20)
    M seednode/README.md (9)
    M seednode/bisq.env (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3985.patch
https://github.com/bisq-network/bisq/pull/3985.diff

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