Add basic RTM_GETADDR support.

  [iproute.py]
  - Basic RTM_GETADDR support (currently IPv6-only).
  - Add the rest of Linux's IFA_F_* flags values.

  [mark_test.py]
  - Fix comment typo.

Bug: 17769720
Change-Id: I4e883a6e01c825ee0de75314f12c0892e96d5a15
2 files changed