resolv_integration_test: Test RRs in authority section and additional section

The authority section and additional section may have relevant
information about the query. Although getanswer() of
packages/modules/DnsResolver/getaddrinfo.cpp doesn't parse the
content, check them that don't crash the resolver, just in case.

Test: cd packages/modules/DnsResolver && atest
Change-Id: I2b441687a574616f775737b469ebb3cc2dbc377e