Do NOT disc_load from ram_copies when master_node is set

Setting master_nodes to a node with ram_copies replica and
that node had not loaded the table, could cause it load an
empty table, even though (non master) nodes had disc_replicas.

This meant that tables where unexpected empty after multiple failures
happened. When this happen do not load the table and wait for user
to force_load it on some node, preferably with a disk copy.

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