Sporadic unit test failure - NameError for Azure

[clintoncwolfe]

Unit tests occasionally fail with:

  1) Error:
azure transport::azure_client#test_0006_cannot instantiate azure_client vault client without a vault name:
NameError: uninitialized constant Azure::KeyVault
    /home/travis/build/inspec/train/test/unit/transports/azure_test.rb:99:in `block (3 levels) in <top (required)>'
  2) Error:
azure transport::azure_client#test_0004_can use azure_client graph client:
NameError: uninitialized constant Azure::GraphRbac
    /home/travis/build/inspec/train/test/unit/transports/azure_test.rb:87:in `block (3 levels) in <top (required)>'

Likely missing a require in a test file