Lowering LogWaitTimeout to half a second.

This makes replication latency go down tremendously,
from average 5 seconds to 1 second (in a test that also
does a reparent in the middle, so it's pretty good).
Disable super_to_set_timestamp during rep only.

When we start a player, we enable it. When we stop
all players, we disable it. Much cleaner.
Lowering LogWaitTimeout to 1/2s for everybody.