Draft preliminary changes for IPv6 test.
Draft preliminary changes for IPv6 test.


Former-commit-id: 8f80b07abf1ff6f283c7906f82ac38072fb2b4cd
tomdee/libnetwork-plugin,Symmetric/libcalico,insequent/libcalico,caseydavenport/libcalico,plwhite/libcalico,TrimBiggs/libnetwork-plugin,projectcalico/libcalico,tomdee/libcalico,robbrockbank/libcalico,L-MA/libcalico,projectcalico/libnetwork-plugin,TrimBiggs/libnetwork-plugin,TrimBiggs/libcalico,djosborne/libcalico,alexhersh/libcalico