Add custom sections to systemd network #309

Job	Run time
Puppet / Static validations	16s
Puppet / 8 (Ruby 3.2)	48s
Puppet / 7 (Ruby 2.7)	56s
Puppet / Distro Puppet - Archlinux rolling	1m 51s
Puppet / Puppet 8 - Ubuntu 20.04	2m 29s
Puppet / Puppet 7 - Ubuntu 20.04	2m 21s
Puppet / Puppet 8 - Ubuntu 22.04	1m 55s
Puppet / Puppet 7 - Ubuntu 22.04	1m 47s
Puppet / Puppet 8 - Debian 11	1m 46s
Puppet / Puppet 7 - Debian 11	1m 45s
Puppet / Puppet 8 - Debian 12	1m 49s
Puppet / Puppet 7 - Debian 12	1m 42s
Puppet / Test suite	1s
	19m 26s

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