Drop support for python2

python2 is EOL, let's move on and only support python3.

Change-Id: Ieffda4edea9cc19484c04420ed703f7141ef9f15
diff --git a/lib/tls b/lib/tls
index d05536b..baafb59 100644
--- a/lib/tls
+++ b/lib/tls
@@ -227,13 +227,7 @@
 function init_cert {
     if [[ ! -r $DEVSTACK_CERT ]]; then
         if [[ -n "$TLS_IP" ]]; then
-            if python3_enabled; then
-                TLS_IP="IP:$TLS_IP"
-            else
-                # Lie to let incomplete match routines work with python2
-                # see https://bugs.python.org/issue23239
-                TLS_IP="DNS:$TLS_IP,IP:$TLS_IP"
-            fi
+            TLS_IP="IP:$TLS_IP"
             if [[ -n "$HOST_IPV6" ]]; then
                 TLS_IP="$TLS_IP,IP:$HOST_IPV6"
             fi