Add MTU to lxc conf to make host and container MTU match

If you are using jumbo frames the host side of the veth was being set to
1500.  Docker would set the MTU of the container side of the veth to 9001.
This would lead to a situation in which the two sides of the veth had
different MTU sizes causing issues in network traffic.

Docker-DCO-1.1-Signed-off-by: Darren Shepherd <darren.s.shepherd@gmail.com> (github: ibuildthecloud)
seperate out the terminal functions from lxc to the pkg/term

  Since these functions are indepenent of lxc, and could be used by
  other drivers.

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Move the terminal setup to execdriver, instead of ./pkg/term

  It is independent of any particular driver, but likely used by
  multiple execdrivers. Also, pkg/... is not to have any links to
  docker, which this terminal setup does.

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Adjust kernel version parsing to be more lenient of strange things like "3.12-1-amd64"

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
help contributors be more productive

certainly saved me time after I found this in hack/make.sh :)

Docker-DCO-1.1-Signed-off-by: Tim Ruffles <oi@truffles.me.uk> (github: github_handle)
fix divide by zero error

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
correcting the package name for the terminal setup

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Merge pull request #4335 from tianon/what-the-etc-group

Convert api/server.go to also use the handy user package
fix content-type docker copy

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4323 from timruffles/patch-2

help contributors be more productive
update api Maintainers file

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Update mkimage-yum to not read /etc/redhat-release from the host

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #4348 from tianon/fix-yum-tagging

Update mkimage-yum to not read /etc/redhat-release from the host
Merge pull request #4341 from vieux/fix_content_type_copy

fix content-type docker copy
Merge pull request #4328 from vieux/fix_4298

fix divide by zero error
Merge pull request #4316 from tianon/more-lenient-kernel-version

Adjust kernel version parsing to be more lenient of strange things like "3.12-1-amd64"
Merge pull request #4342 from vieux/update_maintainers_api

update api Maintainers file
Merge pull request #4308 from vbatts/vbatts-seperate_driver_term

seperate out the terminal functions from lxc
make docker build -rm=true default #4292

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Merge pull request #4292 from cpuguy83/4291_make_rm_default_for_build

make docker build -rm=true default