riak 2.0.0-pre20 (devel)

Closes #27978.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
zsh_completion: add brew switch support.

The Homebrew command `switch` will now be completed and installed
fomulas can be completed. The installed versions (the last argument of
`brew switch [formula] [version]`) is not completed at this point.

Closes #27966.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Always call Process.wait with an argument