Relates to #2480

We were tolerating some unintentional ESI behaviour due to the
xml check hitting.

We now either avoid running into the xml check or specifically
test that we are hitting it.

In addition, add some logexpects to tighten checks

ver_p depends on the amount of data we have read ahead, so it is not
suitable to get predictable results for ESI testing

for the default symbolname prefix ("vmod_")

This should help the transition for VMOD writers that rely on the
SHA256_* functions.

Fixes #2468

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This reverts commit 83425a05.