[MacPorts] #53280: docker @1.12.5: update to 1.12.6 [security]

[MacPorts]

#53280: docker @1.12.5: update to 1.12.6 [security]
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 Reporter:  l2dy    |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  docker
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 Fix runC privilege escalation (CVE-2016-9962)

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Ticket URL: <https://trac.macports.org/ticket/53280>
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