bsc_msc: Handle the loss of the MSC connection better

Instead of simply exiting the application we will handle it by
giving up all SCCP connections, once we have the MSC back we will
send a GSM 08.08 reset message, and we will free all resources
related to these connections. This includes the primary and secondary
lchan of these connections.

While we are not connected to the MSC we will handle each message
that would open a SCCP connection by giving up the lchan. This has
only been compile tested and will need to be manually tested during
a test session.

This also highlights a DoS that could be used against OpenBSC
by setting up a lchan but never send any GSM L3 message. We will have
to fix that at some point.

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