freetdm: Fix hangup supervision on inbound calls for Analog E&M
mod_freetdm: Handle read errors gracefully when the device is dead already
freetdm: ftmod_zt: Refactor event processing to store OOB events that arrive during read/write operations
Merge remote branch 'ssh/v1.2.stable-em_management' into v1.2.stable-em_management