merge existing config when committing

Fixes #1141

Docker-DCO-1.1-Signed-off-by: Wes Morgan <cap10morgan@gmail.com> (github: cap10morgan)
Update daemon docs and help messages for --iptables and --ip-forward

Fix docs and help messages of --iptables and --ip-forward to describe the true case behaviour

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
Clean up the "go test" output from "make test" to be much more readable/scannable

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Exclude more "definitely not unit tested Go source code" directories from hack/make/test

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Update port_redirection.rst

Fix flags
Remove duplicated description of --mtu

commit baa70e975186bb0ee8a4b16b9374cb6e794f8975 duplicates
the description of --mtu.
This patch removes the duplicated description.

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
Add missing options -t and -v to images subcommand doc

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
Fix boilerplate text in Apache license

This commit updates the Apache license boilerplate with actual information. The Apache license appendix (designed to be removed before publication) states:

```
APPENDIX: How to apply the Apache License to your work.

To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!)...
```

Additionally, the copyright year was not included. Copyright notices must reflect the current year. This commit updates the listed year to 2014.

see: http://www.copyright.gov/circs/circ01.pdf for more info

Docker-DCO-1.1-Signed-off-by: Phillip Alexander <git@phillipalexander.io> (github: phillipalexander)
Prevent dynamic allocation of previously allocated ports

Docker-DCO-1.1-Signed-off-by: Andy Kipp <andy@rstudio.com> (github: kippandrew)
Better test error message

Docker-DCO-1.1-Signed-off-by: Andy Kipp <andy@rstudio.com> (github: kippandrew)
Be more explicit in finding next port to allocate

Docker-DCO-1.1-Signed-off-by: Andy Kipp <andy@rstudio.com> (github: kippandrew)