Improved X-Registry-Auth content instructions

Hi,

this is a small contribution to fix some slightly unprecise information about the `X-Registry-Auth` header required to pull from private registries through the remote API. After a lot of trial and I error I managed to find that the documentation indications had this issues:

* Apparently single quotes cannot be used and double quotes (regular JSON) is required.
* Also the `auth` key must be passed even if empty or a 403 will result.
* It was not clear what the `serveraddress` had to be.

I added some small clarifications for anyone taking a look at the docs to keep them from the problems I've encountered. Hope this is helpful.

Thanks to all the contributors for bringing so much awesomeness to the linux world. :)

Signed-off-by: David Pelaez Tamayo <hello@davidpelaez.me>
Update remote_api_client_libraries.md

Ordering all clients alphabetically, by language.
Including all available languages in `page_keywords`.

Signed-off-by: Abhinav Ajgonkar <abhinav316@gmail.com>
add the timeutils package

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
use custom marshalling for JSONLog

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Removed runconfig.ParseSubcommand

 Removed runconfig.ParseSubcommand, changed it to runconfig.Parse and editted related tests and modules

Signed-off-by: Oh Jinkyun <tintypemolly@gmail.com>
Merge pull request #8095 from jfrazelle/cp-parse-subcommand-rebase

Removed runconfig.ParseSubcommand
Merge pull request #8041 from unclejack/lower_allocations_broadcastwriter

lower the number of allocations in broadcastwriter
Add a new MAINTAINERS file for the builder.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #8097 from erikh/builder_maintainers

Add a new MAINTAINERS file for the builder.
Merge pull request #8025 from davidpelaez-forks/docs-fix

Improved X-Registry-Auth content instructions
Merge pull request #8081 from abh1nav/master

Update remote_api_client_libraries.md
Try to avoid issues when the Docker daemon restarts.

This change will allow the Docker daemon's init script to wait up to 5
minutes before being forcibly terminated by the initscript. Many
non-trivial containers will take more than the default 3 seconds to
stop, which can result in containers whose rootfs is still mounted and
will not restart when the daemon starts up again, or worse, orphan
processes that are still running.