Depricate ServiceInstance.clients
Depricate ServiceInstance.clients

The list of clients is not currently generated by the broker.  If
this is needed in the fucture it should be a list of primary hostnames.

Change-Id: I79a7e267b5270821cff4452d8e80570da2545e3e
Reviewed-by: Gabor Gombas <3bb8c49439d9d044594e1c6967f991d0b4248a64@morganstanley.com>

quattor/aquilon-protocols,quattor/aquilon-protocols