Changes

Reject M3UA with "M3UA Network Appearance"

The information element "Network Appearance" is not supported. In case
it is included in a received message, an error is sent to the remote
peer to indicate this. Additionally a message is sent on the log output.

Related: OS#6240
Change-Id: Ia2c2004a7495376fd3f44d26f6cf1b6d277c9b2f