Regression test 'backup_restore" did not work against PG8.4
Regression test 'backup_restore" did not work against PG8.4

In the test script, there was a configuration 'wal_level' which
exist after PostgreSQL 9.0.

This patch was created by Amit Langote.

bwtakacy/prev_pg_rman_repo,ooyamams/pg_rman,bwtakacy/prev_pg_rman_repo,ooyamams/pg_rman