Cherry-pick #7783 to 6.x: X-Pack binaries#8442

Merged

graphaelli merged 1 commit intoelastic:6.xfrom graphaelli:backport_7783_6.x

Sep 27, 2018

+431-30

Commits on Sep 25, 2018

Build Elastic licensed beats separately (elastic#7783 )

exekias
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graphaelli
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