CI: K8sFQDNTest retry initial DNS lookups

We target jenkins.cilium.io and vagrant-cache.ci.cilium.io as the remote
targets for the FQDN tests. Sometimes, the DNS lookups fail and so does
the test. We now retry for 30 seconds. When your DNS lookup at first
doesn't succeed, try try again.

Signed-off-by: Ray Bejjani <ray@isovalent.com>

test/k8sT/fqdn.go

@@ -45,14 +45,27 @@ var _ = Describe("K8sFQDNTest", func() {
 	)
 
 	BeforeAll(func() {
-		// In case the IPs changed, update them here
-		addrs, err := net.LookupHost("vagrant-cache.ci.cilium.io")
-		Expect(err).Should(BeNil(), "Error getting IPs for test")
-		worldTargetIP = addrs[0]
-
-		addrs, err = net.LookupHost("jenkins.cilium.io")
-		Expect(err).Should(BeNil(), "Error getting IPs for test")
-		worldInvalidTargetIP = addrs[0]
+		// In case the IPs changed from above, update them here
+		var lookupErr error
+		err := helpers.WithTimeout(func() bool {
+			var addrs []string
+			addrs, lookupErr = net.LookupHost("vagrant-cache.ci.cilium.io")
+			if lookupErr != nil {
+				lookupErr = fmt.Errorf("error looking up vagrant-cache.ci.cilium.io: %s", lookupErr)
+				return false
+			}
+			worldTargetIP = addrs[0]
+
+			addrs, lookupErr = net.LookupHost("jenkins.cilium.io")
+			if lookupErr != nil {
+				lookupErr = fmt.Errorf("error looking up jenkins.cilium.io: %s", lookupErr)
+				return false
+			}
+			worldInvalidTargetIP = addrs[0]
+
+			return true
+		}, "Could not get vagrant-cache.ci.cilium.io and jenkins.cilium.io IPs", &helpers.TimeoutConfig{Timeout: helpers.MidCommandTimeout})
+		Expect(err).Should(BeNil(), "Error obtaining IPs for test: %s", lookupErr)
 
 		kubectl = helpers.CreateKubectl(helpers.K8s1VMName(), logger)
 		demoManifest = helpers.ManifestGet(kubectl.BasePath(), "demo.yaml")