Add dagster-azure package with various storage components

This adds the following components based on Azure Data Lake Storage
Gen2 (and Azure Blob Storage where appropriate):

- ADLS2FileCache and adls2_file_cache
- ADLS2FileManager
- ADLS2IntermediateStore
- ADLS2ObjectStore
- the adls2_resource providing direct access to Azure Data Lake Storage
- the adls2_system_storage system storage

This is pretty similar to the S3 implementation, the main difference
being configuration: Azure's SDK requires credentials to be passed
explicitly, so the credential is expected in configuration.

Tests currently require an access key to complete any tests marked
'nettest'.

python_modules/libraries/dagster-azure/.coveragerc

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+[run]
+branch = True

python_modules/libraries/dagster-azure/LICENSE

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python_modules/libraries/dagster-azure/MANIFEST.in

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+recursive-include dagster_azure *.sh
+recursive-include dagster_azure *.yaml
+recursive-include dagster_azure *.txt
+recursive-include dagster_azure *.template
+include LICENSE

python_modules/libraries/dagster-azure/dagster_azure/__init__.py

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+from dagster.core.utils import check_dagster_package_version
+
+from .version import __version__
+
+check_dagster_package_version('dagster-azure', __version__)

python_modules/libraries/dagster-azure/dagster_azure/adls2/__init__.py

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+from .adls2_fake_resource import ADLS2FakeClient, create_adls2_fake_resource
+from .file_cache import ADLS2FileCache, adls2_file_cache
+from .file_manager import ADLS2FileHandle, ADLS2FileManager
+from .intermediate_store import ADLS2IntermediateStore
+from .object_store import ADLS2ObjectStore
+from .resources import adls2_resource
+from .system_storage import adls2_plus_default_storage_defs, adls2_system_storage
+from .utils import create_adls2_client
+
+# from .compute_log_manager import ADLS2ComputeLogManager
+# from .solids import ADLS2Coordinate, file_handle_to_adls2

python_modules/libraries/dagster-azure/dagster_azure/adls2/adls2_fake_resource.py

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+"""
+TODO sd2k: implement.
+"""
+from collections import defaultdict
+from contextlib import contextmanager
+import io
+import random
+
+from azure.core.exceptions import ResourceNotFoundError
+
+from dagster.seven import mock
+
+
+def create_adls2_fake_resource(account_name):
+    '''Create a mock ADLS2 client for test.'''
+    return ADLS2FakeClient(account_name, 'fake-creds')
+
+
+class ADLS2FakeClient(object):
+    '''Stateful mock of an ADLS2 client for testing.
+
+    Wraps a ``mock.MagicMock``. Containers are implemented using an in-memory dict.
+    '''
+
+    def __init__(self, account_name, credential):
+
+        self._account_name = account_name
+        self._credential = mock.MagicMock()
+        self._credential.account_key = credential
+        self._file_systems = {}
+
+    @property
+    def account_name(self):
+        return self._account_name
+
+    @property
+    def credential(self):
+        return self._credential
+
+    @property
+    def file_systems(self):
+        return self._file_systems
+
+    def get_file_system_client(self, file_system):
+        return self._file_systems.setdefault(
+            file_system, ADLS2FakeFilesystemClient(self.account_name, file_system)
+        )
+
+    def get_file_client(self, file_system, file_path):
+        return self.get_file_system_client(file_system).get_file_client(file_path)
+
+
+class ADLS2FakeFilesystemClient(object):
+    '''Stateful mock of an ADLS2 filesystem client for testing.'''
+
+    def __init__(self, account_name, file_system_name):
+        self._file_system = defaultdict(ADLS2FakeFileClient)
+        self._account_name = account_name
+        self._file_system_name = file_system_name
+
+    @property
+    def account_name(self):
+        return self._account_name
+
+    @property
+    def file_system_name(self):
+        return self._file_system_name
+
+    def keys(self):
+        return self._file_system.keys()
+
+    def get_file_system_properties(self):
+        return {"account_name": self.account_name, "file_system_name": self.file_system_name}
+
+    def has_file(self, path):
+        return bool(self._file_system.get(path))
+
+    def get_file_client(self, file_path):
+        return self._file_system[file_path]
+
+    def create_file(self, file):
+        return self._file_system[file]
+
+    def delete_file(self, file):
+        for k in list(self._file_system.keys()):
+            if k.startswith(file):
+                del self._file_system[k]
+
+
+class ADLS2FakeFileClient(object):
+    '''Stateful mock of an ADLS2 file client for testing.'''
+
+    def __init__(self):
+        self.contents = None
+        self.lease = None
+
+    def get_file_properties(self):
+        if self.contents is None:
+            raise ResourceNotFoundError("File does not exist!")
+        return {"lease": self.lease}
+
+    def upload_data(self, contents, overwrite=False, lease=None):
+        if self.lease is not None:
+            if lease != self.lease:
+                raise Exception("Invalid lease!")
+        if self.contents is not None or overwrite is True:
+            if isinstance(contents, str):
+                self.contents = contents.encode('utf8')
+            elif isinstance(contents, io.BytesIO):
+                self.contents = contents.read()
+            elif isinstance(contents, io.StringIO):
+                self.contents = contents.read().encode('utf8')
+            elif isinstance(contents, bytes):
+                self.contents = contents
+            else:
+                print("Uploading unknown data")
+                self.contents = contents
+
+    @contextmanager
+    def acquire_lease(self, lease_duration=-1):  # pylint: disable=unused-argument
+        if self.lease is None:
+            self.lease = random.randint(0, 2 ** 9)
+            try:
+                yield self.lease
+            finally:
+                self.lease = None
+        else:
+            raise Exception("Lease already held")
+
+    def download_file(self):
+        if self.contents is None:
+            raise ResourceNotFoundError("File does not exist!")
+        return ADLS2FakeFileDownloader(contents=self.contents)
+
+
+class ADLS2FakeFileDownloader(object):
+    '''Mock of an ADLS2 file downloader for testing.'''
+
+    def __init__(self, contents):
+        self.contents = contents
+
+    def readall(self):
+        return self.contents
+
+    def readinto(self, fileobj):
+        fileobj.write(self.contents)