System tests: quadlet network test

[ygalblum]

Does this PR introduce a user-facing change?

No

None

[vrothberg]

Looks like there are copy-paste artifacts from the volume test left.

[ygalblum]

Looks like there are copy-paste artifacts from the volume test left.

@vrothberg Sorry for these. There're now fixed

[ygalblum]

@vrothberg following your last comment I realized that there was something wrong in the test itself. This lead me to find an issue in the Volume test (copy pasting erroneous code will produce erroneous code :) ). The fix to the Volume test is here: #16970.
Once both tests were fixed I found an issue in the handling of Network services in Quadlet. The fix is here: #16971.
So, while the test here is correct, it will only pass after #16971 is merged and this branch is rebased on it

[ygalblum]

The fix to the code (#16971) was merged to main. This branch was rebased on top of the new main. So, it's ready to merge

[rhatdan]

LGTM
@edsantiago @vrothberg PTAL

[TomSweeneyRedHat]

LGTM
but would like head nods from @edsantiago and @vrothberg

[rhatdan]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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