In some cases it may be possible to detect whether an rbtree is corrupted.
Skip over any corrupted nodes, and their children, while iterating.
Additionally, log a message whenever a bad entry is detected. This behavior
may be enabled by the client by setting the 'logger' and 'debug' properties
for a particular instance of an RbTree.

Modify the --print-ionbuffer parser to use the new RbTree implementation.

Change-Id: I2ed2364b5e7d42ee009a0a49876feb82ab0fa78c