Start background workers on consistent state (#262)

Allows workers to start on hot standby.

Author: adamguo0

src/clientauth.c

@@ -326,7 +326,7 @@ clientauth_init(void)
 	shmem_startup_hook = clientauth_shmem_startup;
 
 	worker.bgw_flags = BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION;
-	worker.bgw_start_time = BgWorkerStart_RecoveryFinished;
+	worker.bgw_start_time = BgWorkerStart_ConsistentState;
 	worker.bgw_restart_time = 1;
 	worker.bgw_notify_pid = 0;
 	sprintf(worker.bgw_library_name, PG_TLE_EXTNAME);

src/passcheck.c

@@ -286,7 +286,7 @@ passcheck_check_password_hook(const char *username, const char *shadow_pass, Pas
 	 * 2. Spin up background worker.
 	 */
 	worker.bgw_flags = BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION;
-	worker.bgw_start_time = BgWorkerStart_RecoveryFinished;
+	worker.bgw_start_time = BgWorkerStart_ConsistentState;
 	worker.bgw_restart_time = 1;
 	worker.bgw_notify_pid = MyProcPid;
 	sprintf(worker.bgw_library_name, PG_TLE_EXTNAME);