Support hairpin NAT

This re-applies commit b39d02b with additional iptables rules to solve the issue with containers routing back into themselves.

The previous issue with this attempt was that the DNAT rule would send traffic back into the container it came from. When this happens you have 2 issues.
1) reverse path filtering. The container is going to see the traffic coming in from the outside and it's going to have a source address of itself. So reverse path filtering will kick in and drop the packet.
2) direct return mismatch. Assuming you turned reverse path filtering off, when the packet comes back in, it's goign to have a source address of itself, thus when the reply traffic is sent, it's going to have a source address of itself. But the original packet was sent to the host IP address, so the traffic will be dropped because it's coming from an address which the original traffic was not sent to (and likely with an incorrect port as well).

The solution to this is to masquerade the traffic when it gets routed back into the origin container. However for this to work you need to enable hairpin mode on the bridge port, otherwise the kernel will just drop the traffic.
The hairpin mode set is part of libcontainer, while the MASQ change is part of docker.

This reverts commit 63c303eecdbaf4dc7967fd51b82cd447c778cecc.

Docker-DCO-1.1-Signed-off-by: Patrick Hemmer <patrick.hemmer@gmail.com> (github: phemmer)
Not fail on updating parent links

Fixes #8796

Signed-off-by: Alexandr Morozov <lk4d4@docker.com>
Fix Docker Hub tags list specification

The current implementation of the Docker Hub returns a list of objects
containing the tag name and the layer id.

Docker-DCO-1.1-Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>
Revise Docs Maintainers list

Removing Sonat from docs maintainers because he no longer has time to complete all the responsibilities. Many thanks to Sonat for his help.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Use the HTTP Last-Modified http header as the mtime value for ADD cmd when present

Closes #8331

Signed-off-by: Doug Davis <dug@us.ibm.com>
pkg/namesgenerator: add Yeong-Sil Jang

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Fix typo in Docker Links chapter of User Guide
Fix mkdir typo in dockerfile_best-practices.md.
Merge pull request #9029 from ovh/fix/doc

Fix Docker Hub tags list specification
Merge pull request #9057 from andi5/typo-best-practices

Fix mkdir typo in dockerfile_best-practices.md.
Merge pull request #9052 from andreyst/master

Fix typo in Docker Links chapter of User Guide
Remove the redundant include_search in mkdocs.yml
Merge pull request #6810 from phemmer/4442-hairpin-nat

Support hairpin NAT
Add missing docs for #8509

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Merge pull request #9028 from unclejack/add_yeong-sil_jang

pkg/namesgenerator: add Yeong-Sil Jang
Merge pull request #8716 from duglin/Issue8331

Use the HTTP Last-Modified http header as the mtime value for ADD cmd when present
Merge pull request #9014 from LK4D4/fix_parent_failing

Not fail on updating parent links
Merge pull request #9069 from cpuguy83/docs_for_pr8509

Add missing docs for #8509
Merge pull request #9032 from fredlf/revise-docs-maintainers

Revise Docs Maintainers list
Merge pull request #9065 from tobegit3hub/master

Remove the redundant include_search in mkdocs.yml