Create a SerializableComparable class derived from the Serializable
class.
Added the following functions to the SerializableComparable class:
'__eq__'
'__ne__'
Disable the '__hash__' function in the SerializableComparable class as
some derived classes are mutable.
Use the SerializableComparable class in hardware.py and
extensions/base.py
This should make unit testing users of the class easier when doing a
self.assertEqual() or self.assertNotEqual()
Added some initial unit testing for encoding.py
Change-Id: If0f14b3bfe7f1391f65dd730a16a534afed0da82
1285baee1c