Create all tables before spawning threads in random_directio test

CONFIG: ./test_random_directio -t 5 -m none -T 5 -S create,drop,verbose

Parent: Create 5 threads; sleep 5 seconds

Beginning cycle 1/5

Suspend child

Check DB

[1538470981:698083][13759:0x7ff83b39b700], WT_SESSION.open_cursor: __wt_schema_get_table_uri, 35: 'table:rev' cannot be used until all column groups are created: Invalid argument

Copy database home directory using direct I/O to run recovery,

along with a saved 'pre-recovery' copy.

Open database, run recovery and verify content

test_random_directio: FAILED: check_db/850: session->open_cursor(session, uri_rev, NULL, NULL, &rev): Invalid argument

process aborting

../../../test/csuite/random_directio/smoke.sh: line 18: 13759 Aborted                 (core dumped) $RUN_TEST -T $threads -S create,drop,verbose

FAIL random_directio/smoke.sh (exit status: 1)