Remove defunct makefile recipes for release

[mathias-goebel]

closes #156

go: downloading github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
error obtaining VCS status: exit status 128
	Use -buildvcs=false to disable VCS stamping.
make: *** [/go/src/github.com/etcd-io/auger/Makefile:67: release-docker-build] Error 1
make: *** [Makefile:55: release] Error 2

[jmhbnz]

/retitle Remove defunct makefile recipes for release

[jmhbnz]

Hey @mathias-goebel thanks for tidying this all up, just need to sign commit and we are good to merge, i.e:

git reset --soft HEAD~2
git commit -s -m "Remove defunct makefile recipes for release."
git push --force

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