LU-12073 tests: fix conf-sanity test_123 startup

LU-12073 tests: fix conf-sanity test_123 startup

The startup of conf-sanity test_123aa() et.al. shouldn't try to use
all of the OSTs if they have not been formatted into the filesystem
by the previous tests.  It may run after test_109b() in a non-DNE
config, which is only using "startup" and "cleanup", so it should
do the same.

Test-Parameters: trivial testlist=conf-sanity
Test-Parameters: testgroup=review-dne-zfs-part-1 testlist=conf-sanity
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ibf76895ec51c881df0df257ccd680af3213ebbe5
Reviewed-on: https://review.whamcloud.com/34428
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>