BUG-1469: introduce ReflectiveExceptionMapper

Convenience class for use when simple instantiation is acceptable and
the mapper instance can be shared.

Change-Id: I1946155a46b94fda5067ccbffcbf3b72f2ce8e3d
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-1469: introduce ReflectiveExceptionMapper"