haven: Improve print statements

Improve print statements around errors to provide more useful
information and add hex dumps of data being sent to RM and over message
queues. Hex dump of the message is invaluable to validating whether
messages are correctly being formatted.

Change-Id: I95dc665ce00795f347d4820178e09bf43b8f31c3
Signed-off-by: Elliot Berman <eberman@codeaurora.org>