To conform better with the logging level standards
move away from using LOG.exception when the level
is more appropriately a warning/warn.
Also changes how a message that can not be sent is really
a critical error and should be treated as such (since such an
error affects the overall execution model).
Change-Id: I7cebd882b655958d539be36ce3b4deb75ac4a0b7
28b2f8fb1b