Check RefCount when uploading single block
Cleanup
Fixing post storage block negative test
Removed test
fix: mongo health endpoint

 - change status message to be 'mongo is active' or 'mongo is not
   active'

 - included a alive method() for mongomock, since that feature is not
   yet in pypi.
fix: mongo vault statistics fix

- block statistics were being read from files collection, just changed
  it around to read from the blocks collections instead.

- added a unit test, that would test the scenario, where files and
  blocks were added to a particular vault and the stats change.
Config value to skip tests on diagnostic endpoints
Merge pull request #220 from jc7998/fix

API Tests: Fix - removing test
fix: cassandra vault list with marker and limit

- fix marker to be '' instead of '0' when the marker isnt specified
Merge pull request #223 from TheSriram/mongo_health_endpoint_correction

fix: mongo health endpoint
Merge pull request #219 from jc7998/check_ref_count

API Tests: Check RefCount when uploading single block
Merge pull request #224 from TheSriram/mongo_vault_statistics_fix

fix: mongo vault statistics fix
fix: simplify marker logic
fix: swift block names in storage

- swift driver was adding a 'blocks_' prefix to the names of the blocks
  being stored in swift, they should always be of the form:

    sha1 + '_' + uuid5
Merge pull request #225 from jc7998/diagnostics

API Tests: Config value to skip tests on diagnostic endpoints
Merge pull request #226 from TheSriram/cassandra_vault_list_bugfix

fix: cassandra vault list with marker and limit
Merge pull request #227 from TheSriram/swift_blockname_fix

fix: swift block names in storage