Commits on Jan 11, 2019

1. [ML] Wait for autodetect to be ready in the datafeed …

   This is a reinforcement of elastic#37227.  It turns out that
   persistent tasks are not made stale if the node they
   were running on is restarted and the master node does
   not notice this.  The main scenario where this happens
   is when minimum master nodes is the same as the number
   of nodes in the cluster, so the cluster cannot elect a
   master node when any node is restarted.
   
   When an ML node restarts we need the datafeeds for any
   jobs that were running on that node to not just wait
   until the jobs are allocated, but to wait for the
   autodetect process of the job to start up.  In the case
   of reassignment of the job persistent task this was
   dealt with by the stale status test.  But in the case
   where a node restarts but its persistent tasks are not
   reassigned we need a deeper test.
   
   Fixes elastic#36810

   

   droberts195 committed Jan 11, 2019
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