LU-9378 utils: split getstripe and find from lfs.1

LU-9378 utils: split getstripe and find from lfs.1

Split the getstripe and find commands from the lfs.1 man page into
their own lfs-getstripe.1 and lfs-find.1 man pages.

While updating the lfs-find.1 man page I realized that the short
options for "-print" and "-print0" were incorrectly documented
in both the usage message as well as the man page, which implies
that the short options were rarely, if ever, used.

Fix the "--print" option to be correctly documented as "-P" instead
of "-p", and deprecate the usage of "-p" for "--print0" in favour
of "-0".  This gives us the opportunity to reclaim "-p" for "--pool",
which is already used as such for "lfs df", "lfs getstripe", and
"lfs setstripe", after some period of printing a deprecation warning.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I9aa7a415d109d269c646fd034ea77785a94cab07
Reviewed-on: https://review.whamcloud.com/30464
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>