Merge pull request #15252 from ssahani/dhcpv6-mud

DHCPv6: Add support to send MUD URL

diff --cc man/systemd.network.xml
Simple merge

diff --cc src/network/networkd-network-gperf.gperf
Simple merge

diff --cc src/network/networkd-network.c
Simple merge

diff --cc src/network/networkd-network.h
Simple merge

diff --cc test/fuzz/fuzz-network-parser/directives.network
Simple merge