Merge pull request #21344 from yuwata/network-ignore-carrier-loss-timespan

network: make IgnoreCarrierLoss= also take a timespan

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

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

diff --cc src/network/networkd-link.h
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