CI: travis-ci: speed up osx build by running brew scripted, switch to latest osx image
we used to use travis-ci brew plugin to install "socat", travis-ci brew
plugin works predictable in "all update" mode. sometimes it might take 12 minutes.
let us improve developer velocity by running brew from command line. It takes 2 minutes
instead of 12 minutes
latest osx seems to have more stable brew, let us switch to latest osx available.
osx images list: https://docs.travis-ci.com/user/reference/osx/#macos-version
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