helm: Remove use of nslookup
nslookup seems to query all the search domains and return 1 if any fail, which in this case means that it never actually succeeds. nc already will fail if DNS doesn't work, so just remove the nslookup loop and rely solely on nc instead.
https://phabricator.apertis.org/T9457
Signed-off-by: Ryan Gonzalez ryan.gonzalez@collabora.com