Add preempted ResultCode for WrappedResult and preempt API for ServerGoalHandle#1117

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naiveHobo wants to merge 2 commits intoros2:rollingfrom

naiveHobo:add-preempt

Commits on May 17, 2020

Add preempted ResultCode for WrappedResult and preempt API for ServerGoalHandle
naiveHobo
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Remove action_msgs::msg::GoalStatus::STATUS_PREEMPTED references and hard code to 7
naiveHobo
committed