lock/open based rfbsl
remove hard-coded otp key length
7/31, 8/1의 d-day가 같던 버그 수정. 달 잘못셋음
apply otp unittest
sha1 test
OTP unittest
split testmain/otp test. support "make test, make run_test"
remove unused code
add d-day testing, fix overflow problem
add "make test"
support multiple otp. but cannot show current service.
fix d-day display