Description of problem:

Some lvm2 commands pass the 'help' output to the *stderr* stream.
e.g.  'lvs -o help'  

While otherwise its shown 'lvm help' on *stdout* stream.

Then there is also 'second' logic applied - when command gives
error (i.e. wrong option) such help is then printed on 'stderr'

As an effect when user wants to i.e. 'grep' help output, he
needs to figure out first where the output may come from,
since 'expected data' appear on 'error' stream in some cases.

Version-Release number of selected component (if applicable):
2.02.152

How reproducible:


Steps to Reproduce:
1. lvs -o help  2>/dev/null      >> no visible output
2.
3.

Actual results:
User requested 'help' is on stdour and stderr.

Expected results:
Users requested help always on should appear always on standard output stream (stdout)

Additional info: