IPACM: Fixes for Wi-Fi offload for AP-STA mode

 1. fix ethernet offset issue
 2. don't assume first event is always external router mac address
 3. don't add routing rules for wan ip address

Change-Id: If1ce15e329a9e6d66e32953403a77d788956e368
6 files changed
tree: 8f1f16a1be31f998998551a2340c49935b8bcd2f
  1. ipacm/
  2. ipanat/
  3. configure.ac
  4. Makefile.am