[2282merge] move an in-memory test data file to the new directory.

diff --git a/src/lib/datasrc/memory/tests/testdata/example.org-nsec3-empty-salt.zone b/src/lib/datasrc/tests/memory/testdata/example.org-nsec3-empty-salt.zone
similarity index 100%
rename from src/lib/datasrc/memory/tests/testdata/example.org-nsec3-empty-salt.zone
rename to src/lib/datasrc/tests/memory/testdata/example.org-nsec3-empty-salt.zone