LU-17251 osp: force precreate if create_count grows

LU-17251 osp: force precreate if create_count grows

Force the MDS to precreate OST objects if "osp.*.create_count" is
written and the OSP does not have at least that many precreated
objects locally.  This avoids doing complex operations in test
scripts to force precreation to run, which slows down the tests
and increases the chance that a test might fail.

Previously opd_precreate_force was only used for handling OSTs
that were reformatted and this reset "create_count" to minimum, so
move that to the reformat case rather than in the precreate code
path so it does not reset "create_count" when it was just set.

Remove the "env" argument from several precreate-related functions,
since it wasn't used in those functions, and that made it difficult
to call them from the "create_count" parameter handling.

Test-Parameters: testlist=parallel-scale env=ONLY=test_rr_alloc
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Iac35c1b981fcd6ab2d1ea5abc9ffe2e4563ebbe5