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/lib/keystone b/lib/keystone
index 6198e43..f52cc3f 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -609,8 +609,8 @@
 
     # Start proxies if enabled
     if is_service_enabled tls-proxy; then
-        start_tls_proxy '*' $KEYSTONE_SERVICE_PORT $KEYSTONE_SERVICE_HOST $KEYSTONE_SERVICE_PORT_INT &
-        start_tls_proxy '*' $KEYSTONE_AUTH_PORT $KEYSTONE_AUTH_HOST $KEYSTONE_AUTH_PORT_INT &
+        start_tls_proxy keystone-service '*' $KEYSTONE_SERVICE_PORT $KEYSTONE_SERVICE_HOST $KEYSTONE_SERVICE_PORT_INT
+        start_tls_proxy keystone-auth '*' $KEYSTONE_AUTH_PORT $KEYSTONE_AUTH_HOST $KEYSTONE_AUTH_PORT_INT
     fi
 
     # (re)start memcached to make sure we have a clean memcache.