Add support for using Azure storage

Adds dds command line tool with the same interface as ddsclient.
The `dds` command only works with Azure blob storage.
The `azcopy` command is required to upload and download.
Additional configuration is required to specify the
storage account and bucket(container) where the files
will be stored.

Author: johnbradley

.circleci/config.yml

@@ -5,7 +5,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/python:3.6
+      - image: circleci/python:3.7
     working_directory: ~/DukeDSClient
     steps:
       - checkout:
@@ -19,6 +19,7 @@ jobs:
           command: |
             python3 -m venv venv
             . venv/bin/activate
+            pip install --upgrade pip
             python setup.py install
             pip install -r devRequirements.txt
             pip install coveralls
@@ -36,7 +37,7 @@ jobs:
             coverage run --source=ddsc setup.py test
   deploy:
     docker:
-      - image: circleci/python:3.6
+      - image: circleci/python:3.7
     steps:
       - checkout
 

ddsc/azure/__init__.py

@@ -0,0 +1,23 @@
+"""Duke data service command line project management utility."""
+import sys
+from ddsc.ddsclient import DDSClient, AZURE_BACKING_STORAGE
+from ddsc.exceptions import DDSUserException
+
+
+def main(args=None):
+    if args is None:
+        args = sys.argv[1:]
+    client = DDSClient(backing_storage=AZURE_BACKING_STORAGE)
+    try:
+        client.run_command(args)
+    except DDSUserException as ex:
+        if client.show_error_stack_trace:
+            raise
+        else:
+            error_message = '\n{}\n'.format(str(ex))
+            sys.stderr.write(error_message)
+            sys.exit(2)
+
+
+if __name__ == '__main__':
+    main()