bump(sys-kernel/bootengine): Updates for new dracut version

Dracut is now in portage-stable and DRACUT_MODULES is unused.
Update bootengine dependencies so we can use btrfs and mdadm in the
initrd. Drop kbd because I'm excluding out the terminfo module now.
maint(coreos-base/coreos): Drop aufs tools from our images.
Merge pull request #607 from marineam/aufs

maint(coreos-base/coreos): Drop aufs tools from our images.
Merge pull request #606 from marineam/dracut

bump(sys-kernel/bootengine): Updates for new dracut version
maint(sys-apps/systemd): Sync patches with upstream

Upstream has merged all of our reload bug fixes, replace local patches
with the upstream versions.

Drop the patch that removed the check for /etc/os-release. We always
initialize missing files in the initrd so it isn't needed any more.
fix(profiles): Move CFLAGS, remove -g, add -mtune=generic

Slowly moving make.conf into profiles, here is another piece. We never
actually use the built debug information so remove -g to produce a
little less of it. Add -mtune=generic to let GCC optimize for whatever
it thinks the most common processors are.
fix(profiles): Enable ipv6 globally because WTF DUH!
Merge pull request #609 from marineam/systemd

maint(sys-apps/systemd): Sync patches with upstream
Merge pull request #610 from marineam/cflags

Profile maintance
chore(app-emulation/docker): remove symlink-usr case

We are never shipping another -generic image so just make symlink-usr
the only .service file.
fix(app-emulation/docker): add TMPDIR=/var/tmp

This fixes the issue reported here where /tmp runs out os space during a
docker save

https://github.com/coreos/coreos-vagrant/issues/49#issuecomment-43287780
bump(coreos-base/update_engine): send pings hourly

Pull in this PR: https://github.com/coreos/update_engine/pull/32
Merge pull request #611 from philips/bump-update-engine

bump(coreos-base/update_engine): send pings hourly
Merge pull request #608 from philips/set-docker-tmpdir

fix(app-emulation/docker): add TMPDIR=/var/tmp
fix(sys-apps/systemd): Stop warning about "X-Fleet" sections
Merge pull request #612 from marineam/systemd

fix(sys-apps/systemd): Stop warning about "X-Fleet" sections
fix(coreos-base/coreos-init): bump to simpler motdgen
bump(coreos-base/coreos-cloudinit): bump to 0.7.0

https://github.com/coreos/coreos-cloudinit/releases/tag/v0.7.0
bump(coreos-base/coreos-cloudinit): bump to 0.7.1

https://github.com/coreos/coreos-cloudinit/releases/tag/v0.7.1
bump(coreos-base/coreos-init): Fixes for containers and motdgen