Revert "Bug 639, Bug 641, Bug 642: This is MD-SAL based sample

implementation of a learning switch with optimizations in how
packet is forwarded."

This reverts commit 273b2a25453e9fe24f973fd6f7bc8c65bcf372d3.

Change-Id: I1e7df9bff60aa790cc267e438572e54378eb94b3
Signed-off-by: Ed Warnicke <eaw@cisco.com>