Add more tests for drfrontend routines

From mxm...@gmail.com on July 30, 2014 12:00:48

We have the following list of DR frontend functions that need tests:

1. drfront_access
2. drfront_searchenv
3. drfront_bufprint
4. drfront_tchar_to_char
5. drfront_tchar_to_char_size_needed
6. drfront_char_to_tchar
7. drfront_get_env_var
8. drfront_get_absolute_path
9. drfront_get_app_full_path
10. drfront_is_64bit_app
11. drfront_is_graphical_app
12. drfront_convert_args
13. drfront_cleanup_args
14. drfront_appdata_logdir
15. drfront_string_replace_character
16. drfront_string_replace_character_wide
17. drfront_set_symbol_search_path
18. drfront_sym_init
19. drfront_sym_exit
20. drfront_fetch_module_symbols
21. drfront_create_dir
22. drfront_remove_dir

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1488