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
This fix was added to kube-batch: kubernetes-retired/kube-batch#912

[volcano-sh-bot]

Welcome @yodarshafrir1!

It looks like this is your first PR to volcano-sh/volcano 馃帀.

Thank you, and welcome to Volcano. 😃

[yodarshafrir1]

/assign @k82cn

[TravisBuddy]

Hey @yodarshafrir1,
Something went wrong with the build.

TravisCI finished with status errored, which means the build failed because of something unrelated to the tests, such as a problem with a dependency or the build process itself.

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TravisBuddy Request Identifier: c3fc1390-1522-11ea-a5d4-6b7b0fca08ad

[k82cn]

/lgtm
/approve

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[TravisBuddy]

Hey @yodarshafrir1,
Your changes look good to me!

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TravisBuddy Request Identifier: 00e1edd0-1568-11ea-a5d4-6b7b0fca08ad