Update .gitignore files

src/lib/dns/benchmarks/.gitignore

@@ -1 +1,2 @@
+/message_renderer_bench
 /rdatarender_bench

src/lib/log/tests/.gitignore

@@ -2,6 +2,8 @@
 /destination_test.sh
 /init_logger_test
 /init_logger_test.sh
+/initializer_unittests_1
+/initializer_unittests_2
 /local_file_test.sh
 /logger_example
 /run_unittests