Github user serg38 commented on the pull request:
https://github.com/apache/cloudstack/pull/1361#issuecomment-174746870
I believe the main reason is to provide the most of backward compatibility.
image_store_details doesn't have NFS version in existing installations so after
the upgrade to this code it will continue working without any additional
changes. However if particular NFS secondary datastore requires explicit
version users simply populate table and restart SSVM.
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