make installcheck

configurable upper bound on locking attempt timeout #216

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Run time

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Job	Run time
PostgreSQL 17	57s
PostgreSQL 16	59s
PostgreSQL 15	58s
PostgreSQL 14	1m 2s
PostgreSQL 13	1m 18s
PostgreSQL 12	1m 0s
PostgreSQL 11	59s
PostgreSQL 10	46s
PostgreSQL 9.6	46s
PostgreSQL 9.5	47s
	9m 32s