Commit partial changes.
Added unit test cases for create/delete/list shares/files/directories.
Merge branch 'dev'
BUG: 1760998 - [PowerShell for XSMB] Cannot access file service when -Environment is specified for new-azurestoragecontext

Fixed a merging issue where file endpoint is set null when specifying -Environment.
Merge branch 'dev'
Merge branch 'upstream/dev'
Merge branch 'dev'
Refactored DM wrapper to allow mock up.
Added unit test cases for upload/download files.
Merge branch 'upstream/dev'
Resolved merge issues of AzureStorageContext moving.
Added unit test cases for WindowsAzureEnvironment as requested.
add the help content for file commands
Merge branch 'dev' of https://github.com/flyrobin/azure-sdk-tools.git
Merge branch 'dev' of github.com:Azure/azure-sdk-tools into storage
Added support for tags on resource level (1561924)
Added support for tags on resource group level (1561924)
Fix unit test failures
Merge pull request #2670 from ogail/storage

Add placeholder for tags project
Get resources by tag (1561927)