Replace fallocate with dd in e2e tests

[uablrek]

What type of PR is this?

/kind bug

What this PR does / why we need it:

K8s does not require support for fallocate in container fs'es, so neither should e2e tests. This PR replaces fallocate with the more primitive, but always working, dd command.

Which issue(s) this PR fixes:

Fixes #111368

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[aojea]

Learning something new ☺️
https://antipaucity.com/2017/08/31/fallocate-vs-dd-for-swap-file-creation/#.Ytwo7eyxWdM

/lgtm
/approve

[aojea]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, uablrek

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[uablrek]

Learning something new relaxed https://antipaucity.com/2017/08/31/fallocate-vs-dd-for-swap-file-creation/#.Ytwo7eyxWdM

In the neighborhood; if a sparse file is acceptable then use;

~ > truncate -s 100G file
~ > ls -lsh file
0 -rw-r--r-- 1 uablrek lgekman 100G Jul 23 20:05 file

This is the best as base for a file system image, but not for a swapfile or in this test where you really must occupy disk space.

And since the file in the test-case is just 10M the gain of using fallocate is minimal.