[2421] Change test data to throw ZoneDataUpdater::AddError

... instead of MasterLoadError.

tests/lettuce/data/example.com-broken

@@ -5,4 +5,7 @@ example.com.	3600	IN	MX	10 mail.example.com.
 www.example.com.	3600	IN	A	192.0.2.1
 ns1.example.com.	3600	IN	A	192.0.2.3
 ns2.example.com.	3600	IN	A	192.0.2.4
-shell.example.com.	3600	IN	SSHFP	# this is clearly broken
+
+;; DNAME + NS (non-apex) throws ZoneDataUpdater::AddError
+ns1.example.com.        3600    IN DNAME    foo.example.com.
+ns1.example.com.        3600    IN NS       bar.example.com.