api/server/MAINTAINERS: add proppy and vieux

Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
removed expect from mkimage-arch since it was not working

Docker-DCO-1.1-Signed-off-by: NikolaMandic <mn080202@gmail.com> (github: NikolaMandic)
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)
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)
portmapper: unit tests for remap problem

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
remove deprecated syntax for docker commit

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Update gorilla/context

Race condition was fixed recently
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
missing `sudo`
fix typo
Merge pull request #6751 from mchelen/patch-3

missing `sudo`
Merge pull request #6752 from mchelen/patch-5

fix typo
added linkage to tugboat, a scala client

Docker-DCO-1.1-Signed-off-by: Doug Tangren <d.tangren@gmail.com> (github: softprops)
Merge pull request #6747 from softprops/master

added linkage to tugboat, a scala client library
Remove extra "Docker" from docs index
Merge pull request #6761 from fgrehm/patch-1

Remove extra "Docker" from docs index
Merge pull request #6631 from SvenDowideit/add-versioning-to-docs-output

Add versioning to docs output