Change Statement unevict method to call UpdateTask

[yodarshafrir1]

What this PR does / why we need it:
This change ensures that when unevict is called the value of nodeInfo.Releasing will be updated as if the task was evicted.

Before this fix, because the task exists on the current nodeInfo, every time unevict is called the Releasing value of the nodeInfo isn't updated and the value remains same as if the task was evicted

Why does it happen:
This happens because unevict calls AddTask:

// Update task in node.
if node, found := s.ssn.Nodes[reclaimee.NodeName]; found {
     node.AddTask(reclaimee)
} 

AddTask will throw an error because this task already exists under the current nodeInfo and therefore will not update the Releasing field as if the current task is Running

Issue: #907

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[yodarshafrir1]

/assign @hex108

[yodarshafrir1]

I signed it

[k82cn]

/ok-to-test
/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k82cn, yodarshafrir1

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