udpn, e2e: Adapt to multiple default gws

After activating dhcpv6_stateful at LRP the agnhost alpine container has
two IPv6 default gateways pointing to the same interface and resolving
to the same mac (so they work the same).

This change ensure the test account for that by deleting all of them in
the test require it.

Signed-off-by: Enrique Llorente <ellorent@redhat.com>

test/e2e/network_segmentation.go

@@ -356,19 +356,24 @@ var _ = Describe("Network Segmentation", func() {
 							if podIP.IP.To4() == nil {
 								ipCommand = append(ipCommand, "-6")
 							}
-							// 1. Find current default route and delete it
-							defRoute, err := e2ekubectl.RunKubectl(udnPod.Namespace,
+							// 1. Find current default routes and delete them
+							defRoutes, err := e2ekubectl.RunKubectl(udnPod.Namespace,
 								append(ipCommand, "route", "show", "default")...)
 							Expect(err).NotTo(HaveOccurred())
-							defRoute = strings.TrimSpace(defRoute)
-							if defRoute == "" {
+							if defRoutes == "" {
 								continue
 							}
-							framework.Logf("Found default route %v, deleting", defRoute)
+
+							// Remove last new line to propertly split them using new line
+							defRoutes = strings.TrimSuffix(defRoutes, "\n")
+
+							framework.Logf("Found default routes %v, deleting", defRoutes)
 							cmd := append(ipCommand, "route", "del")
-							_, err = e2ekubectl.RunKubectl(udnPod.Namespace,
-								append(cmd, strings.Split(defRoute, " ")...)...)
-							Expect(err).NotTo(HaveOccurred())
+							for _ = range strings.Split(defRoutes, "\n") {
+								_, err = e2ekubectl.RunKubectl(udnPod.Namespace,
+									append(cmd, "default")...)
+								Expect(err).NotTo(HaveOccurred())
+							}
 
 							// 2. Add a new default route to use default network interface
 							gatewayIP := iputils.NextIP(iputils.Network(podIP).IP)