LU-5170 lfs: Standardize llapi messages for lfs_find()

LU-5170 lfs: Standardize llapi messages for lfs_find()

Error messages in the llapi functions called by lfs_find()
are updated to a standard format.  Messages are prefixed with
the name of the utility and the command that caused the error.
User-provided values are delimited with single quotes.

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Ia324887964b4a89cc5d4f92d3f3a7fa421e03dca
Reviewed-on: https://review.whamcloud.com/28997
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>