TestAdapter is not versioned appropriately

[singhsarab]

Description

The Test adapter dll is not getting versioned appropriately. Assembly version as well as FileVersion are locked at 14.0.0.0
Given 2 adapters, there is no way to figure out which one is the latest.

Steps to reproduce

Create 2 MSTest Unit projects, and make sure both refer to different nuget package versions.

Expected behavior

The adapters are properly versioned.