We shouldn't be logging in a signal handler.

This reverts commit c728efdb.

Be more explicit about what we're waiting for, among other changes.
This appears to fully correct the wait issues.

We believe there may be a race condition in bootstrap.sh when run with
-j.  We know that running it without -j should be at least
deterministic (whether or not correct), so we'll go with that in
anticipation of releasing v1.2.

Thanks to Thierry Panthier for pointing this out.

add param:confirm-blind-transfer var:confirm_blind_transfer that makes blind transfers keep the transferrer on the line until its confirmed that the call was completed or brings it back to the bridge.  blind_transfer_ack app can be executed in the dp by the transferee to indicate sucess or fail or a sucessful bridge will automatically trigger a success