[RN#2] Move packet socket creation from clatd

Netd opens the packet socket fd and pass the prepared
socket fd to clatd. This is a preparation for reducing
the clatd required capability.

Test: manual test
1. Connect to ipv6-only wifi.
2. Try IPv4 traffic.
   $ ping 8.8.8.8

Bug: 212345928
Change-Id: I6f2916d30b7bf86cdbe6803d0f3e78e510ae5196
1 file changed
tree: a52dba1262c59a06303ccb0425167c30593ab67c
  1. bpf_progs/
  2. client/
  3. include/
  4. libnetdbpf/
  5. netutils_wrappers/
  6. server/
  7. tests/
  8. .editorconfig
  9. Android.bp
  10. NOTICE
  11. OWNERS
  12. PREUPLOAD.cfg
  13. TEST_MAPPING