(pup-1712) Use beaker 1.10 in acceptance (needed for trusty)

See https://github.com/puppetlabs/beaker/pull/219 for details.
Merge pull request #2565 from kylog/issue/pup-1712/trusty-acceptance-use-newer-beaker

(pup-1712) Use beaker 1.10 in acceptance (needed for trusty)