Add custom sections to systemd network #312

Job	Run time
Puppet / Static validations	22s
Puppet / 8 (Ruby 3.2)	48s
Puppet / 7 (Ruby 2.7)	1m 1s
Puppet / Distro Puppet - Archlinux rolling	1m 59s
Puppet / Puppet 8 - Ubuntu 20.04	2m 37s
Puppet / Puppet 7 - Ubuntu 20.04	2m 35s
Puppet / Puppet 8 - Ubuntu 22.04	1m 44s
Puppet / Puppet 7 - Ubuntu 22.04	1m 44s
Puppet / Puppet 8 - Debian 11	1m 42s
Puppet / Puppet 7 - Debian 11	1m 39s
Puppet / Puppet 8 - Debian 12	1m 38s
Puppet / Puppet 7 - Debian 12	1m 36s
Puppet / Test suite	0s
	19m 25s

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