caoyuan 779b0f8310 Move horizon precheck into its own role
Change-Id: I4e2f8e21bfd295d235d1264e427328e4baa85df3
Partially-implements: blueprint condition-pre-check
2017-01-02 22:41:38 +08:00
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2016-11-03 14:48:58 +08:00