* mw/etcd: revert 'add fallthrough'

This removes 'fallthrough' for *etcd* which is not needed. This was
added in 00f5c779 but is totally not needed and creates backwards
incompat behavior even.

Thanks to @johnbelamaric for pointing this out in #925.

* remove here as well

* Revert "remove here as well"

This reverts commit 9d44397827425e567af01d43564c4294b42e98c9.

* Revert "mw/etcd: revert 'add fallthrough'"

This reverts commit 0cfe3cb1ab5495ed38a8a0486e3f5386f3bd95dc.

* mw/{etcd,kubernetes}: use fallthrough correctly

reverts of reverts, will rebase and squash later.