Add DNS '8.8.8.8' server to use in test

In GH Action, sometime, DNS server return compressed response, which is not comply with RFS, so go is unable to parse response.

Signed-off-by: Yevhen Vydolob <[email protected]>

test/basic_test.go

@@ -70,7 +70,7 @@ var _ = ginkgo.Describe("dns", func() {
 		gomega.Expect(string(out)).To(gomega.ContainSubstring("wikipedia.org	nameserver = ns0.wikimedia.org."))
 	})
 	ginkgo.It("should resolve LDAP SRV record for google.com", func() {
-		out, err := sshExec("nslookup -query=srv _ldap._tcp.google.com")
+		out, err := sshExec("nslookup -query=srv _ldap._tcp.google.com 8.8.8.8")
 		gomega.Expect(err).ShouldNot(gomega.HaveOccurred())
 		gomega.Expect(string(out)).To(gomega.ContainSubstring(`_ldap._tcp.google.com	service = 5 0 389 ldap.google.com.`))
 	})