LU-13941 osp: Silently lower requested create_count to maximum

LU-13941 osp: Silently lower requested create_count to maximum

When setting create_count it should silently accept a larger value
and truncate it to the current maximum.

This would avoid issues if that limit is changed in the future.

HPE-bug-id: LUS-5960
Test-Parameters: trivial testlist=parallel-scale,sanity
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I4727ba6fca747e1ae9850188ef63c7abb89904be
Reviewed-on: https://review.whamcloud.com/39967
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>