test: add e2e for non-overlapping placements

[schmichael]

Followup to #10446

Fails (as expected) against 1.3.x at the wait for blocked eval (because the allocs are allowed to overlap).

Passes against 1.4.0-beta.1 (as expected).

[jrasell]

LGTM.

Two optional inline suggestions; it seems standard to also use input as the directory name that holds test jobs, again this is very optional nit-pick.

[schmichael]

Two optional inline suggestions; it seems standard to also use input as the directory name that holds test jobs, again this is very optional nit-pick.

Ah yeah, forgot that:

$ find e2e -type d -name input | wc -l
30
$ find e2e -type d -name testdata | wc -l
3

I'd kind of like to start using testdata since it appears we're trying to move e2e tests closer to "normal" go tests (or at least that was my impression from looking at #14598) since testdata is the standard for inputs.

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