Bug 36307: SMS::Send driver errors are not captured and stored

Bug 36307: SMS::Send driver errors are not captured and stored

If an SMS::Send driver succeeds, it returns a value that evaluates to true. Every driver I've inspected uses croak when it encounters a failure state.

When an SMS message fails to send, code hard codes the failure code to NO_NOTES (No notes from SMS driver).

We should store the real error in `failure_code` and display that if the failure code doesn't match a known failure code.

Test Plan:
1) Apply this patch
2) Set SMSSendDriver to any value
3) Generate a pending sms message
4) Run the following query:
   update message_queue set status = 'failed', failure_code = "This is a test";
5) View the patron's messages, note the delivery note contains the
   contents of the failure code
6) Run the following query:
   update message_queue set status = 'failed', failure_code = "SMS_SEND_DRIVER_MISSING";
7) Reload the patron's messages, not the delivery note is now "The SMS
   driver could not be loaded".

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>