Usage of IP addresses like 1.2.3.4 + 2.3.4.5 is not recommended, as they
might point to actually used and non-reserved IPs.
Quoting from RFC 5737 AKA "IPv4 Address Blocks Reserved for
Documentation" (see https://datatracker.ietf.org/doc/html/rfc5737):
| The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24 (TEST-NET-2), and
| 203.0.113.0/24 (TEST-NET-3) are provided for use in documentation.
So use 203.0.113.0/24 in our docs/code/testsuite instead.
Change-Id: Ic786a12c006a1fe11b67b788e01cca377f08771f