Hand out each client registration 5 times.
Hand out each client registration 5 times.

This is not an implementation of #5426, in at least two ways:
1. The same proxy may get the same client twice (unlikely with current
proxy volume).
2. The registration's count doesn't go down when one of its proxies
disappears.

Doing this is however a step towards #5426.

glamrock/flashproxy,arlolra/flashproxy,arlolra/flashproxy,glamrock/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,arlolra/flashproxy,infinity0/flashproxy,infinity0/flashproxy,glamrock/flashproxy,glamrock/flashproxy,infinity0/flashproxy,infinity0/flashproxy,arlolra/flashproxy,arlolra/flashproxy,arlolra/flashproxy