chronos is indirectly blacklisted because of missing periph_uart feature.
hamilton doesn't provide periph_uart when stdio_rtt is disabled (because
of ethos dependency to stdio_uart) and ruuvitag/thingy52 provide the
periph_uart feature so stdio_uart can work on these boards.
- Define test_utils_interactive_sync as DEFAULT_MODULE in Makefile.tests_common
- For tests disabling autoinit, add test_utils_interactive_sync to main
- Add DISABLE_MODULE += test_utils_interactive_sync for tests requiring
sudo, `tests/shell`, `tests/minimal` and `tests/stdin`
- Add shell_commands to tests/periph_wdt and tests/struct_tm_utility to
pull `r` and `s` commands
- Remove includes and usage in `tests/main.c` for tests that where
already using test_utils_interactive_sync
- Since `printf()` is buffered it might not arrive in a single
read to pexpect. Regex which terminate in a group match might
match only some elements, this might break tests that depend
on exact group matching.
