Port LogicalRouterSNATAdd and LogicalRouterDNATSNATAdd #1832

Job	Run time
Code	1m 39s
System (1.21.x, cluster, dir)	1m 48s
Documentation	6m 54s
Client (1.21.x, ubuntu-latest)	26s
System (1.21.x, cluster, btrfs)	2m 42s
Client (1.21.x, macos-latest)	27s
System (1.21.x, cluster, lvm)	1m 43s
Client (1.21.x, windows-latest)	2m 26s
System (1.21.x, cluster, zfs)	2m 50s
System (1.21.x, cluster, ceph)	2m 51s
System (1.21.x, cluster, random)	1m 45s
System (1.21.x, standalone, dir)	1m 49s
System (1.21.x, standalone, btrfs)	1m 42s
System (1.21.x, standalone, lvm)	1m 43s
System (1.21.x, standalone, zfs)	2m 41s
System (1.21.x, standalone, ceph)	1m 50s
System (1.21.x, standalone, random)	1m 46s
System (stable, cluster, dir)	1m 56s
System (stable, standalone, dir)	2m 50s
System (tip, cluster, dir)	2m 53s
System (tip, standalone, dir)	1m 59s
	46m 40s

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