Make expected output match reality again.

Fix rttest output after rtsock.c r1.329 that RTF_DONE to routes sent
via sysctl(2)

Add 5 test cases for
- adding default route with "deault"
- adding default route with "0.0.0.0/0"
- adding 0.0.0.0 route
- adding routes with mask
ok yasuoka