Add full unit tests for listener

This change adds unit tests for the two listener library
modules, and the scripts to allow these tests to be driven
during the image build as a verification. In addition the
coverage stats for the tests are reported.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: If52c3819ebf6b2f12d63e996d49c7e5c3e6ef9b5
10 files changed