Support multiple ServiceId/ClusterId

[rwkarg]

If partition_key is an ascii column with value <service_id-cluster_id> then it looks like this should support having multiple services (applications) and clusters (blue/green deployments of the same service) in the same keyspace. The only real change would be to pass in the service/cluster id to the membership/gateway configuration so that the appropriate value is set for that column.

OrleansCassandraUtils/src/OrleansCassandraUtils/InitializeOrleansDatabase.cql

Lines 15 to 16 in a3f86ad

	// Will always be zero, used to send all rows to the same partition for the static version to work
	partition_key int,