nat/ussd: Add 'show ussd-connection' vty command

This command returns the current state of the connection to the USSD
side channel provider. It shows whether a provider has been connected
and authorized or not.

Fixes: OW#953
3 files changed
tree: bc9bb7f23a1d9ed68ffa42ac967ba21ce6c9155a
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README