[1384] rename test for consistency

src/lib/datasrc/tests/database_unittest.cc

@@ -1246,7 +1246,7 @@ TEST_F(MockDatabaseClientTest, ttldiff) {
 
 // Unless we ask for individual RRs in our iterator request. In that case
 // every RR should go into its own 'rrset'
-TEST_F(MockDatabaseClientTest, ttldiff_separate_rrsets) {
+TEST_F(MockDatabaseClientTest, ttldiff_separate_rrs) {
     ZoneIteratorPtr it(this->client_->getIterator(Name("example.org"), true));
 
     // Walk through the full iterator, we should see 1 rrset with name