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* Take and apply some parameters from controldata when starting as replica https://www.postgresql.org/docs/10/static/hot-standby.html#HOT-STANDBY-ADMIN There is set of parameters which value on the replica must be not smaller than on the primary, otherwise replica will refuse to start: * max_connections * max_prepared_transactions * max_locks_per_transaction * max_worker_processes It might happen that values of these parameters in the global configuration are not set high enough, what makes impossible to start a replica without human intervention. Usually it happens when we bootstrap a new cluster from the basebackup. As a solution to this problem we will take values of above parameters from the pg_controldata output and in case if the values in the global configuration are not high enough, apply values taken from pg_controldata and set `pending_restart` flag.