Revert "add test looping over children of a TLV"

Revert "add test looping over children of a TLV"

This reverts commit c105db87995ecee180771bc55f4d43a37efed9bd.

apparently adding local tlvs breaks the wimax tests.

Error : src/tests/keywords/wimax[7]: Failed parsing attribute reference &26.24757.84.9.5.7 - Parent type of nested attribute 26 must be of type "struct", "tlv", "vendor", "vsa" or "group", got "octets"
Error : src/tests/keywords/wimax[7]: &26.24757.84.9.5.7
Error : src/tests/keywords/wimax[7]:     ^

arguably the error is correct.  but in the interest of making CI
pass, and not annoying others, we just disable the failing test
for now