--help option and help command should print to stdout not stderr

--help and help are successful commands so output should not go to error.

QE teams have requested this change, also users doing docker help | less
or docker run --help | less would expect this to work.

Usage statement should only be printed when the user asks for it.
Errors should print error message and then suggest the docker COMMAND --help
command to see usage information.

The current behaviour causes the user to have to search for the error message
and sometimes scrolls right off the screen.  For example a error on a
"docker run" command is very difficult to diagnose.

Finally erros should always exit with a non 0 exit code, if the user
makes a CLI error.

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
Skip "no chain" error on deleting chain in Unmap

Fixes #6904
Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Merge pull request #6052 from rhatdan/help

--help option and help command should print to stdout not stderr
Truncate the names list on ps

Signed-off-by: Robert Bittle <guywithnose@gmail.com>
Merge pull request #7686 from guywithnose/trancateNames

Truncate the names list on ps
Revert "--help option and help command should print to stdout not stderr"

This reverts commit 61b129d81802e3c988cc0e67e488b24968dd748a.

Signed-off-by: Victor Vieux <vieux@docker.com>
Merge pull request #7764 from vieux/revert

Revert "--help option and help command should print to stdout not stderr"
Updating B2D upgrade instructions for 1.2.0.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Merge pull request #7762 from LK4D4/skip_delete_no_chain_#6904

Skip "no chain" error on deleting chain in Unmap
Merge pull request #7766 from fredlf/update_b2d_upgrading

Updating B2D upgrade instructions for 1.2.0.