Tests DnsStream event handling, both for plain TCP DNS and DNS over TLS. The DoT test requires the "openssl s_server" command line tool to mock a simple TLS server. Thus the test's TLS part is skipped if openssl it not available. The test works for both DNS_OVER_TLS_USE_GNUTLS and DNS_OVER_TLS_USE_OPENSSL. The DoT case fails due to a bug, which is fixed on the next commit. (cherry picked from commit 726bcd81b965afa3c9cc71f6c7a81b1eefb4bcf5)
System and Service Manager
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