Make pgpool2 backend flag configurable #1498

Job	Run time
Execute install_dbserver tests for PostgreSQL 14 on RockyLinux8	2m 21s
Execute ansible-lint	1m 1s
Execute manage_dbserver tests for PostgreSQL 14 on RockyLinux8	3m 11s
Execute manage_pgbouncer tests for PostgreSQL 14 on RockyLinux8	3m 10s
Execute init_dbserver tests for PostgreSQL 14 on RockyLinux8	2m 22s
Execute setup_pgbouncer tests for PostgreSQL 14 on RockyLinux8	2m 22s
Execute setup_pgpool2 tests for PostgreSQL 14 on RockyLinux8	2m 34s
Execute setup_replication tests for PostgreSQL 14 on RockyLinux8	4m 31s
Execute setup_repmgr tests for PostgreSQL 14 on RockyLinux8	2m 39s
Execute setup_repo tests for PostgreSQL 14 on RockyLinux8	3m 19s
Execute manage_pgpool2 tests for PostgreSQL 14 on RockyLinux8	2m 3s
Execute setup_dbt2 tests for PostgreSQL 14 on RockyLinux8	4m 15s
Execute setup_dbt2_client tests for PostgreSQL 14 on RockyLinux8	2m 26s
Execute setup_dbt2_driver tests for PostgreSQL 14 on RockyLinux8	2m 24s
Execute setup_dbt3 tests for PostgreSQL 14 on RockyLinux8	3m 21s
Execute setup_dbt7 tests for PostgreSQL 14 on RockyLinux8	2m 30s
	44m 29s

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