csi: Allow over-provisioning for external volume #1041
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What this PR does / why we need it:
It allow over-provisioning for external volume
Which issue(s) this PR fixes:
Fixes #1036 (https://github.com/handrea2009/issue-1036)
Special notes for your reviewer:
If we don't want to allow over-provisioning then we have to to add only the update_free_size() in CreateVolume() when ext_volume before returning, cause currently the free size is not updated in this case