Added ability to drop session/connection if a message could not be sent to daemon (e.g., if daemon is unavailable).
Added ability to drop session/connection if a message could not be sent to daemon (e.g., if daemon is unavailable).

iscsi-osx/iSCSIInitiator,iscsi-osx/iSCSIInitiator,iscsi-osx/iSCSIInitiator