Added unit tests for expanded IPv6 multicast address creation APIs. Added unit test for IPAddress::ToString. Incorporated refactoring to cleanly and consistently integrate these new tests.
Added unit tests for expanded IPv6 multicast address creation APIs. Added unit test for IPAddress::ToString. Incorporated refactoring to cleanly and consistently integrate these new tests.

openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core,openweave/openweave-core