Fix timestamp in end-of-recovery WAL records.

We used time(null) to set a TimestampTz field, which gave bogus results.
Noticed while looking at pg_xlogdump output.

Backpatch to 9.3 and above, where the fast promotion was introduced.

Author: hlinnaka

src/backend/access/transam/xlog.c

@@ -8408,7 +8408,7 @@ CreateEndOfRecoveryRecord(void)
 	if (!RecoveryInProgress())
 		elog(ERROR, "can only be used to end recovery");
 
-	xlrec.end_time = time(NULL);
+	xlrec.end_time = GetCurrentTimestamp();
 
 	WALInsertLockAcquireExclusive();
 	xlrec.ThisTimeLineID = ThisTimeLineID;
@@ -8433,7 +8433,7 @@ CreateEndOfRecoveryRecord(void)
 	 * changes to this point.
 	 */
 	LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
-	ControlFile->time = (pg_time_t) xlrec.end_time;
+	ControlFile->time = (pg_time_t) time(NULL);
 	ControlFile->minRecoveryPoint = recptr;
 	ControlFile->minRecoveryPointTLI = ThisTimeLineID;
 	UpdateControlFile();