* release: automate the release

This PR aims to various pieces into place so we can automate the coredns
release. It needs the script from coredns/release to be installed. Dreck
is to be setup as described in coredns/release/README.md

The release-coredns script can be tested and allows for other branches
than master to be test.

This PR also features some cleanup in the Makefile.release so we don't
call the godep target for each linux release - this speeds it up for
some bit.

Manually running ./release-coredns -t auto-release builds the artifects
for this release, but (of course) doesn't upload anything yet.

Add /release to the OWNERS and allow command to be executed (this still
needs to be tested).
Signed-off-by: Miek Gieben <miek@miek.nl>

* that makefile target doesnt exist anymore
Signed-off-by: Miek Gieben <miek@miek.nl>

* test release for now
Signed-off-by: Miek Gieben <miek@miek.nl>

* Slightly better output
Signed-off-by: Miek Gieben <miek@miek.nl>

* remove again
Signed-off-by: Miek Gieben <miek@miek.nl>