upgrade script for 5.0

This MR changes the packaging files to do the following:

• before package uninstallation, systemd socket configuration is listed and saved
• after package installation, a lua script is executed to generate net.listen() commands from the saved configuration
• the generated commands are saved in /var/lib/knot-resolver/.upgrade-4-to-5/kresd.conf.net and printed out during interactive package upgrade

TODO: ensure package upgrade passes:

• Arch
• Debian
• Ubuntu
• CentOS
• Fedora
• Leap

Related #485 (closed)

added 1 commit

• 50d82b59 - distro/rpm: correctly package and create tmpfiles dirs

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added 1 commit

• ac955d96 - daemon/ffimodule: add missing extern to kr_layer_t_static

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marked the checklist item Fedora as completed

changed the description

marked the checklist item CentOS as completed

added 2 commits

• 708bb457 - distro/deb: ensure tmpfiles.d is created before service restart
• ab3c3f2f - daemon/engine: prevent re-definition of the_args

Compare with previous version

marked the checklist item Ubuntu as completed

marked the checklist item Debian as completed

added 27 commits

• ab3c3f2f...f6580063 - 7 commits from branch master
• e0b712b0 - utils/upgrade-4-to-5: socket->net_listen conversion script
• 7f664131 - distro/*: run upgrade-4-to-5 scripts for rpm/deb packages
• 90367f72 - distro/rpm: add manual update for opensuse
• 462ad17c - distro/*: silence kresd during upgrade
• c2a0fc70 - luacheck: allow globals for upgrade script
• f5b57183 - daemon/main: set non-buffering stdout/stderr early
• c71a1838 - distro: generate separate config from upgrade script
• 5e2a588b - daemon/main: set non-buffering stdout/stderr early
• 13c63522 - doc: add net.listen() example with multiple IPs
• 19830c2e - upgrade: use /var/lib path for config instead of /etc
• 0d13cb76 - utils/upgrade: minor changes to upgrade script
• 7fd175f2 - doc/upgrading: mention path to generated config with network interfaces
• aa406298 - distro/deb: use daemon-reload to update units before restart
• aeced046 - distro/deb: save systemd socket conf before http module uninstall
• e4726c4f - distro/rpm: don't disable non-existent kresd@* on uninstall
• 614b2861 - distro/rpm: make sure the rundir is writable by knot-resolver
• 1518beb1 - distro/rpm: correctly package and create tmpfiles dirs
• 633682be - daemon/ffimodule: add missing extern to kr_layer_t_static
• 668554da - distro/deb: ensure tmpfiles.d is created before service restart
• dcf8965a - daemon/engine: prevent re-definition of the_args

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merged

mentioned in commit 2d038195

changed the description