bsc: Allow to disable sending ping/pong to the MSC

Some switches do not like to receive the IPA PING/PONG messages.
Allow to disable the handling with "no timeout-ping" and create
test cases that verify the switching between the modes. Change the
code to trat <= 0 as an invalid timeout.

Fixes: SYS#713
4 files changed
tree: f0c0c198d982ac419bb39d154b5eba01889f855b
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README