Tidy up disused commented code (vectordotdev#8580)

This commit does not functionally change VRL but does remove a block of
commented out test code. The code does not have a link to an issue describing
what should be done to re-enable it and it has sat like this for some months.

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>
Signed-off-by: dbcfd <bdbrowning2@gmail.com>