Allow passing in the IPv4 and IPv6 addresses on the command line.

This allows the address to be determined by netd and passed in,
which makes it possible for the rest of the OS to know what the
clatd IPv6 address is.

Bug: 65674744
Test: atest clatd_test
Test: IPv4 on IPv6-only networks continues to work
Test: clatd continues to avoid existing IPv4 addresses in 192.0.0.0/29
Test: passing NAT64 prefix, IPv4/IPv6 addresses on command line works
Change-Id: I8519c2f01b44022ef036c80aa0df32cd76003055
4 files changed