Use apache for tls-proxy ssl termination

Stud is now abandonware (see https://github.com/bumptech/stud) and is
not packaged in xenial. Lets use Apache for SSL termination since its
there already.

Change-Id: Ifcba410f5969521e8b3d30f02795541c1661f83a
diff --git a/stack.sh b/stack.sh
index 09466a6..119ca85 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1052,6 +1052,7 @@
 
     if is_service_enabled tls-proxy; then
         echo "export OS_CACERT=$INT_CA_DIR/ca-chain.pem" >> $TOP_DIR/userrc_early
+        start_tls_proxy http-services '*' 443 $SERVICE_HOST 80
     fi
 
     source $TOP_DIR/userrc_early