Update documentation noting that SIGCHLD is not proxied.

Docker's --sig-proxy option sends all signals but one to a container. The
exception s SIGCHLD, which is deliberately ignored as it doesn't make sense to
send such a signal to a process in a container. Documentation updates will make
this less confusing if anyone does attempt to do this.

Docker-DCO-1.1-Signed-off-by: Matt Heon <mheon@redhat.com> (github: mheon)
Import public GPG key after adding the openSUSE repository

Docker-DCO-1.1-Signed-off-by: Christian Berendt <berendt@b1-systems.de> (github: berendt)
add Docker version and branch to html header

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Allow / as source of -v

We discussed this at the docker plumbers meetup and for tools and
working on the system for things like boot2docker and coreos this is
needed.  You can already bypass this check so we felt it is ok to start
allowing this feature.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Fixed manpage generation script and README

Update md2man script to generate manpages inside docs/man/ directory. Update
usage documentation in the readme to point to the new docs/man path. Update
Ubuntu makefile to use new path to manpages

Docker-DCO-1.1-Signed-off-by: Matthew Heon <mheon@redhat.com> (github: mheon)
Remove api test for bind mount /
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Remove superfluous reptition from usingdocker.md

Clarify wording about default docker ps options

Fix typo in dockerlinks.md

Docker-DCO-1.1-Signed-off-by: Paul Weaver <pauweave@cisco.com> (github: ch3pjw)
sort flags with the same name in a consistent order

Docker-DCO-1.1-Signed-off-by: Jonathan Boulle <jonathanboulle@gmail.com> (github: jonboulle)
Update nodejs_web_app.md

Docker-DCO-1.1-Signed-off-by: Hyeongkyu Lee <hyeongkyu.lee@navercorp.com> (github: leeplay)
Merge pull request #6712 from SvenDowideit/pr_out_remove_superfluous_reptition_from_usingdocker_md

Remove superfluous reptition from usingdocker.md
Merge pull request #6676 from berendt/opensuse_import_public_gpg_key

Import public GPG key after adding the openSUSE repository
Merge pull request #6716 from leeplay/master

Update nodejs_web_app.md
Update dockerizing.md

fix typo
Merge pull request #6718 from mchelen/patch-1

Update dockerizing.md
State refactoring and add waiting functions

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Use State waiting functions

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
mkimage: use /var/tmp by default instead of /tmp

Additionally, this can be overridden by setting the TMPDIR variable,
like this was already the case for the generic `mkimage.sh` script.

As explained in #6456, the rationale to use `/var/tmp` instead of `/tmp`
is that `/tmp` is often a small tmpfs filesystem with more restricted
rights.

Docker-DCO-1.1-Signed-off-by: Vincent Bernat <vincent@bernat.im> (github: vincentbernat)
Adds check if default ip address is correct format.

It avoids hidden error when ports are redirected from
container to host using -p host_port:guest_port.

Docker-DCO-1.1-Signed-off-by: Jiří Župka <jzupka@redhat.com> (github: jzupka)
Merge pull request #6729 from vincentbernat/fix/mkimage-use-var-tmp

Update mkimage scripts to use /var/tmp by default instead of /tmp
Document memory limit sizing in manpages

The -m flag permits the setting of a memory limit when running a Docker
container. The actual limit set must be a multiple of page size on Linux, so
whatever number the uses passes in will be rounded up if needed. Document this
behavior to prevent confusion. Also fixed several small formatting and grammar
issues in the docker run manpage.

Docker-DCO-1.1-Signed-off-by: Matthew Heon <mheon@redhat.com> (github: mheon)