qemu: Add helpers to handle stat data for qemuStorageLimitsRefresh
Split out the opening of the file and fetch of the stat buffer into a
helper qemuDomainStorageOpenStat. This will handle either opening the
local or remote storage.
Additionally split out the cleanup of that into a separate helper
qemuDomainStorageCloseStat which will either close the file or
call the virStorageFileDeinit function.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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