Add test prefix to test files for less confusion

Author: dlunch

java_runtime/tests/classes/java/io/mod.rs

@@ -1,8 +1,8 @@
-mod buffered_reader;
-mod byte_array_output_stream;
-mod data_input_stream;
-mod data_output_stream;
-mod file_input_stream;
-mod input_stream_reader;
-mod print_writer;
-mod random_access_file;
+mod test_buffered_reader;
+mod test_byte_array_output_stream;
+mod test_data_input_stream;
+mod test_data_output_stream;
+mod test_file_input_stream;
+mod test_input_stream_reader;
+mod test_print_writer;
+mod test_random_access_file;

…tests/classes/java/io/buffered_reader.rs …/classes/java/io/test_buffered_reader.rsjava_runtime/tests/classes/java/io/buffered_reader.rs renamed to java_runtime/tests/classes/java/io/test_buffered_reader.rs java_runtime/tests/classes/java/io/buffered_reader.rs renamed to java_runtime/tests/classes/java/io/test_buffered_reader.rs

@@ -1,8 +1,8 @@
-mod class;
-mod integer;
-mod math;
-mod object;
-mod string;
-mod string_buffer;
-mod thread;
-mod throwable;
+mod test_class;
+mod test_integer;
+mod test_math;
+mod test_object;
+mod test_string;
+mod test_string_buffer;
+mod test_thread;
+mod test_throwable;