Add a Test Common

[alzimmermsft]

There is common logic duplicated across the Storage modules with regards to testing, these commonalities should be promoted to Storage Common and standardized. The key areas are:

• Naming playback JSON files
• Generating and capturing random data
  • Byte arrays
  • Resource names
  • UUIDs
  • Datetimes
• Creating the HttpClient used in clients
• Determining which tests should have playback JSON files records. Not all tests are replayable due to APIs using random resources (datetimes, UUIDs, etc) or due to the playback file size generated (downloading large data sets, numerous service calls).