Simplify configuration of EM to PM connections

To describe a connection from UM to PM one needs to add a section into Columnstore.xml like this for every connection

<PMS1>

       <IPAddr>127.0.0.1</IPAddr>

       <Port>8620</Port>

</PMS1>

If the number of connections is significant it might be tedious to describe them and wasteful to store them in the config.

The suggested way to describe now is to add a single section per PM exists in the cluster and set PrimitiveServers.ConnectionsPerPrimProc to describe how many PM-EM connections must be created by DEC::Setup() method.

It is worth to note the issue will also cover CMAPI part that manipulates the XML configuration adding or removing a node from the cluster.