Merge pull request #144 from rightscale/teal_13_2_acu76466_sender_retry_when_broker_down

acu76466 - Pick up right_agent fix to Sender when send fails
acu78361 squelch thunker output if chowning TTY fails; it's not worth messing up noninteractive sessions
Merge pull request #148 from rightscale/teal_13_03_acu78361_thunker_fix

Teal 13 03 acu78361 thunker fix