add --releasever=/ to mkimage-yum.sh

I didn't realize the commit required a Docker-DCO so it failed the travis-ci build. So I removed the commit from my forked repo. Now it looks like there is a pull request with no commit. So here it is again:

Needed to add '--releasever=/' flag to run yum groupinstall on Centos7 (didn't try on anything else). This snippet from yum man page explains why:

```
Note: You may also want to use the option --releasever=/ when creating the installroot as otherwise the $releasever value is taken from the rpmdb within the installroot (and thus.  will  be  empty,  before  creation).
```

Docker-DCO-1.1-Signed-off-by: Matt Schurenko <matt.schurenko@gmail.com> (github: mschurenko)
Restrict repository names from matching hexadecimal strings

To avoid conflicting with layer IDs, repository names must
not be tagged with names that collide with hexadecimal strings.

Signed-off-by: Eric Windisch <eric@windisch.us>
Added Syntax highlighting file for the KDE Kate Editor

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
deny net host + dns and links with container net

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
fs.Visit() returns nil flag

Signed-off-by: Sven Dowideit <SvenDowideit@docker.com>
More ipallocator refactoring

Now x1.5 faster

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Implement allocating IPs from CIDR within bridge network

Fixes #4986

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Use increment operator

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
docker top: fix command when multiple arguments are supplied

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Fix panic when `ENV ARG=ARG` is used.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Add a test for the multiple arguments passed to `docker top`

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

Add some instructions for Debian 7 (aka Wheezy/Stable)

Signed-off-by: Vishal Doshi <vishal.doshi@gmail.com>
Try to go for 80-char lines and a little md wrangling.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
document the cherry-pick process I'm using to make docs updates

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Move TestRunCidFileCleanupIfEmpty to integration-cli

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Move TestRunCidFileCheckIDLength to integration-cli

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>
Merge pull request #7814 from erikh/fix_parser_env

Fix panic when `ENV ARG=ARG` is used.
Merge pull request #7791 from SvenDowideit/mflag-Visit-returns-nil-flag

fs.Visit() returns nil flag
Merge pull request #7809 from LK4D4/use_increment

Use increment operator
Merge pull request #7812 from erikh/fix_top

docker top: fix command when multiple arguments are supplied