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)
devmapper: include dm_deps information in debug

Signed-off-by: Vincent Batts <vbatts@redhat.com>
daemon logging: unifying output and timestamps

A little refactor of the ./pkg/log so engine can have a logger instance

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Adding self to various maintainers files.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Prettify docs-update.py

Remove commented code, use format for string concatenation, split long lines, fix how-to-run instructions
Signed-off-by: Davide Ceretti <dav.ceretti@gmail.com>
Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Add ENV variables support to WORKDIR build command

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Docker-DCO-1.1-Signed-off-by: Adrien Folie <folie.adrien@gmail.com> (github: folieadrien)

Conflicts:
	builder/builder.go
		This file has been deleted.
Implementing IPv6 functionality for ipallocator

Closes #6975

Signed-off-by: Malte Janduda <mail@janduda.net>
Edits and fixes to Dockerfile Best Practices based on review feedback.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
add test and move one from rm to rmi

Signed-off-by: Victor Vieux <vieux@docker.com>
Add note to docs about lack of shell processing in JSON form

Closes #5509

Signed-off-by: Doug Davis <dug@us.ibm.com>
Add more names

Docker-DCO-1.1-Signed-off-by: Brian Goff <bgoff@cpuguy83-mbp.home> (github: cpuguy83)
Fixed a typo in "Installing Docker on Mac OS X"

evironment -> environment
Multiple fixes to the cli.md document.

*. Fixed headings so the side menu will now be consistent. Some sections
had H3s that were displaying and others did not leaving the left menu
very mismatched.

* Fixed several spelling errors.

* Re-formatted several long lines and badly laid out paragraphs.

* Fixed several double backticks.

* Added backticks to several outputs and variables.

* Removed two issues that are no longer valid.

* Removed several double spaces and extra lines.

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Network Allocation: Proper rollback in case of failure allocation.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Container: Make allocateNetwork and releaseNetwork public.

Since we are moving network allocation outside of container scope (it
will be managed by create/destroy), those functions need to be
accessible from the outside.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Container: Add restore network functionality.

RestoreNetwork() allows the container to restore its NetworkSettings (IP
and public ports).

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Stable Networking: Keep the same network settings across container restarts.

This change will allocate network settings (IP and public ports) at
container creation rather than start and keep them throughout the
lifetime of the container (i.e. until it gets destroyed) instead of
discarding them when the container is stopped.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Daemon: Restore network settings at startup.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Stable MAC addresses: Add support for MAC address restoring.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>