Add custom sections to systemd network #315

Job	Run time
Puppet / Static validations	31s
Puppet / Distro Puppet - Archlinux rolling	2m 17s
Puppet / Puppet 8 - Ubuntu 20.04	2m 46s
Puppet / 8 (Ruby 3.2)	43s
Puppet / Puppet 7 - Ubuntu 20.04	2m 45s
Puppet / 7 (Ruby 2.7)	1m 10s
Puppet / Puppet 8 - Ubuntu 22.04	1m 56s
Puppet / Puppet 7 - Ubuntu 22.04	2m 1s
Puppet / Puppet 8 - Debian 11	1m 52s
Puppet / Puppet 7 - Debian 11	1m 52s
Puppet / Puppet 8 - Debian 12	1m 52s
Puppet / Puppet 7 - Debian 12	1m 51s
Puppet / Test suite	2s
	21m 38s

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