hss: Subscribed-Periodic-RAU-TAU-Timer is in Subscriptio-Data
hss: Subscribed-Periodic-RAU-TAU-Timer is in Subscriptio-Data

At least in version 11.8.0 Release 11 of 3GPP TS 29.272,
Subscribed-Periodic-RAU-TAU-Timer is only permitted inside
Subscription-Data.  Before this patch, the HSS encodes it outside, i.e.
on the "main" level of the DIAMETER AVP tree.

Related: #238

acetcom/nextepc,acetcom/nextepc,acetcom/nextepc,acetcom/nextepc,acetcom/nextepc,acetcom/nextepc,acetcom/nextepc