Use different IPv4 addresses on different clat interfaces.

Previously the code would use 192.0.0.4 on all clat interfaces.
This works, but it has the problem when a clat interface goes
down, we do not reset TCP connections on its IP address if there
is another clat interface up.

Fix this by assigning every clat interface its own IP address in
192.0.0.0/29.

Bug: 12111730
Change-Id: I28c831acd93b0980efea8e90c1cdf8b607beac68
5 files changed