test: fix default ipv6 subnet

[ upstream commit e5e72ab ]

Newer docker seems to refuse the default subnet we are using:

    level=warning msg="Unable to create docker network cilium-net:
    Error response from daemon: invalid network config:
    invalid subnet ::1/112: it should be ::/112\"

Let's go with the machine's suggestion.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>

test/helpers/docker.go

@@ -137,7 +137,7 @@ func (s *SSHMeta) NetworkCreateWithOptions(name string, subnet string, ipv6 bool
 // specified subnet. It is a wrapper around `docker network create`.
 func (s *SSHMeta) NetworkCreate(name string, subnet string) *CmdRes {
 	if subnet == "" {
-		subnet = "::1/112"
+		subnet = "::/112"
 	}
 	return s.NetworkCreateWithOptions(name, subnet, true,
 		"--driver cilium --ipam-driver cilium")