ipatests: in DNS zone file add A record for name server #3837
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Testcase test_server_option_with_unreachable_ad creates a zone file
for AD domain. This file had a hard-coded A record for host specified in
NS record. Some versions of BIND consider this zone invalid and refuse
to start with message:
Fixed by replacing hard-coded value with short name of the AD instance.
This PR also fixed utility function create_temp_file which was returning name of created temp file with a trailing newline character added.