093af1c00a
The $SYSTEMTESTTOP shell variable if often set to .. in various shell scripts inside bin/tests/system/, but most of the time it is only used one line later, while sourcing conf.sh. This hardly improves code readability. $SYSTEMTESTTOP is also used for the purpose of referencing scripts/files living in bin/tests/system/, but given that the variable is always set to a short, relative path, we can drop it and replace all of its occurrences with the relative path without adversely affecting code readability.
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ns1 is the root server.
ns2 and ns5 are both authoritative servers.
ans3 is a mock authoritative server that can return various broken
responses.
ans4 is a mock authoritative server that can return CNAME or DNAME
responses of arbitrary size in arbitrary order.
ns7 is the resolver under test.