LU-14645 utils: setstripe cleanup

LU-14645 utils: setstripe cleanup

lfs setstripe checks stripe parameters differently for PFL and !PFL
layouts. Whereas the PFL layout is checked in comp_args_to_layout()
individually and in llapi_layout_sanity_cb() in pairs, !PFL layout
verification is done partially in several places. Create a common
llapi_stripe_param_verify() for this purpose. Make the checks for
both cases symmetric.

Signed-off-by: Vitaly Fertman <c17818@cray.com>
Change-Id: I456b1b2e876229ac1a354d4e3879624325856574
HPE-bug-id: LUS-9886
Reviewed-on: https://es-gerrit.dev.cray.com/158589
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Reviewed-by: Alexander Boyko <c17825@cray.com>
Tested-by: Alexander Lezhoev <c17454@cray.com>
Reviewed-on: https://review.whamcloud.com/43465
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andriy Skulysh <askulysh@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>