Make minimum values of shared_queues and shared_queue_size GUC parameters

dependent on other settings

shared_queue_size is dependent on the number of datanodes in the cluster since
each datanode may attach itself as a consumer of the shared queue. So the
shared_queue_size now signifies per-datanode value and the actual value used
will be (max_datanodes * shared_queue_size). Existing users should modify their
settings after taking this into consideration.

Similarly, shared_queues highly depends on the number of concurrent queries. We
now conservatively set this to at least 1/4th of max_connections or user
specified value, whichever is higher.

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