Fix for 4223 : dsreplication enable --noSchemaReplication fails: routing table is empty

When dsreplication enable runs it create the replication servers configuration
then the replication domain configuration
then attempt to perform an initialization

if this attempt is made too quickly following the creation of the configuration it
can happen that the replication servers are not connected when the initialization 
is started and the routing tables of the replications servers not accurate.

This fix synchronize the creation of the replication server domain with the 
replication server thread in charge of connecting the replication servers 
together so that this problem can't occur anymore.