In CI master/Istanbul, the PNF registration test cases is frequently failing. After the initial analyses, it seems when queuing the pnf from A&AI, it failed to get the "ipaddress-v4-oam" info out of the response.

Detailed logs can be found as below:
https://logs.onap.org/onap-integration/daily/onap_daily_pod4_master/2021-07/12_02-19/xtesting-smoke-usecases-robot/pnf-registrate/pnf-registrate/log.html#s1-t2