Description of problem:
Device-mapper-persistent-data provides few commands in /usr/sbin/ (rpm -ql device-mapper-persistent-data) and most of them have differences between its -h output and its manpage. So I decided to create a single bug and try to write the main differences command by command. There are already quite a few bugs about this issue, but each of them targets only single command and they don't cover this problem by far. SO I added them to each command her to provide a handy link.
Here are all the the differences command by command. If there is no info under the command, the manpage and -h goves the same options.

cache_check
 - manpage is missing option --clear-needs-check-flag

cache_dump
 - manpage is missing option -o <xml file>

cache_metadata_size
 - whole manpage is missing

cache_repair

cache_restore
 - manpage is missing option -q | --quiet
 - manpage is missing option --omit-clean-shutdown

cache_writeback
 - option --no-metadata-update is written as --skip-metadata-update in manpage
 - manpage is missing option --buffer-size-meg <size>
 - manpage is missing option --list-failed-blocks

era_check

era_dump
 - manpage lists invalid variant of option --repair as -r, which is not recognized and not listed in -h
 - manpage is missing option -o <xml file>

era_invalidate
 - manpage is missing option --metadata-snapshot
 - both manpage and -h are not listing option --written-since, which is only in examples
 - BZ1450196

era_restore
 - whole manpage is missing
 - BZ1450200

pdata_tools
 - no idea what this one should do, it only prints available commands list (which is not the same as rpm -ql) and has no -h option. Also no manpage.

thin_check

thin_delta
 - wrong number in second thin numeric identifier, is --thin1, --snap1 but should be --thin2, --snap2
 - BZ1253031

thin_dump
 - manpage is missing option -o <xml file>
 - -h is missing option --skip-mappings

thin_ls
 - manpage lists option --verbose, but it is unreconized
 - BZ1469183

thin_metadata_size

thin_repair

thin_restore

thin_rmap

thin_show_duplicates
 - can't compare because manpage is missing and command is urecognized
 - BZ1469178

thin_trim
 - can't compare because command is unrecognized (manpage exists)
 - BZ1471095

Version-Release number of selected component (if applicable):
0.7.0-0.1.rc6.el7