ReverseTraffic switches traffic in the reverse direction for the tablet_types specified. The traffic should have been previously switched forward using SwitchTraffic for the cells/tablet_types specified.
For master tablets, ReverseTraffic first stops writes on the target master and waits for the replication to the source to
catchup with the point where the writes were stopped. If the wait time is longer than timeout
the command will error out. For setups with high write qps you may need to increase this value.