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)
Add a step to verify if Docker is working as expected

Like in the other installation guides I added a simple test
to verify that importing images and starting containers is
working.

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)
sort flags with the same name in a consistent order

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

fix typo
Merge pull request #6701 from crosbymichael/mount-root

Allow / as source of -v
correct typo - desination -> destination

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: add test to ensure -v /:/ isn't allowed

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Restrict portallocator to Docker allocated ports

Port allocation status is stored in a global map: a port detected in use will remain as such for the lifetime of the daemon. Change the behavior to only mark as allocated ports which are claimed by Docker itself (which we can trust to properly remove from the allocation map once released). Ports allocated by other applications will always be retried to account for the eventually of the port having been released.

Docker-DCO-1.1-Signed-off-by: Arnaud Porterie <icecrime@gmail.com> (github: icecrime)
Make ErrPortAlreadyAllocated an error interface with a few extras,
adjust tests to fit.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Use last allocated port logic in port allocator

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)