LU-16938 utils: setstripe overstripe multiple OST count

LU-16938 utils: setstripe overstripe multiple OST count

Add an option to "lfs setstripe -C" to specify stripe counts
that are a multiple of the number of OSTs in the filesystem.
Using "-C -1" will create one stripe on all (available) OSTs,
as with "-c -1", to avoid too many stripes.  Using "-C -2"
will create two stripes on each OST, etc.

The maximum multiplier is currently "-C -32", which will
create 32 stripes per OST. It is still possible to specify
a large positive stripe count directly to  "-C" for testing
purposes and to maintain compatibility with current usage.

HPE-bug-id:LUS-11793
Signed-off-by: Rajeev Mishra <rajeevm@hpe.com>
Change-Id: Ib0462d7a9b71853419ea7c30741bb35d576f0d71
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54192
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <patrick.farrell@oracle.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>