Azure-datalake-store

-------------------
* Allow users to explicitly use or invalidate the internal, local cache of the filesystem that is built up from previous `ls` calls. It is now set to always call the service instead of the cache by default.
* Update to properly create the wheel package during build to ensure all pip packages are available.
* Update folder upload/download to properly throw early in the event that the destination files exist and overwrite was not specified. NOTE: target folder existence (or sub folder existence) does not automatically cause failure. Only leaf node existence will result in failure.
* Fix a bug that caused file not found errors when attempting to get information about the root folder.

------------------
* Enforce basic SSL utilization to ensure performance due to `GitHub issue 625 <https://github.com/pyca/pyopenssl/issues/625>`

------------------
* Fix server-side throttling retry support. This is not a guarantee that if the server is throttling the upload (or download) it will eventually succeed, but there is now a back-off retry in place to make it more likely.

------------------
* Update the build process to more efficiently handle multi-part namespaces for pip.

------------------
* Fix an issue with path caching that should drastically improve performance for download

------------------
* Fix for downloader to ensure there is access to the source path before creating destination files
* Fix for credential objects to inherit from msrest.authentication for more universal authentication support
* Add support for the following:

* set_expiry: allows for setting expiration on files
* ACL management:

* set_acl: allows for the full replacement of an ACL on a file or folder
* set_acl_entries: allows for "patching" an existing ACL on a file or folder
* get_acl_status: retrieves the ACL information for a file or folder
* remove_acl_entries: removes the specified entries from an ACL on a file or folder
* remove_acl: removes all non-default ACL entries from a file or folder
* remove_default_acl: removes all default ACL entries from a folder

* Remove unsupported and unused "TRUNCATE" operation.
* Added API-Version support with a default of the latest api version (2016-11-01)