csi: fix filesystem write paths in e2e tests #7361
Merged
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Fixing a few bugs in the e2e test suite for CSI following testing of #7356.
The writer jobs for the CSI e2e tests will write to locations in the alloc dir and not arbitrary locations at the root. This changeset mounts the CSI volume at a location within the alloc dir, uses the alloc ID as a better-namespaced identifier of the file we write, and corrects the shell used by the busybox container.
This PR doesn't quite bring us to a working state; we'll need to fix #7338, #7360, and #7362 at least.