az storage azcopy blob sync: allow setting of --delete-destination

[Arithmomaniac]

Extension name

storage-preview

Description

azure-cli-extensions/src/storage-preview/azext_storage_preview/operations/azcopy.py

Lines 46 to 48 in 902e9bc

	def storage_blob_sync(cmd, client, source, destination):
	azcopy = _azcopy_blob_client(cmd, client)
	azcopy.sync(source, _add_url_sas(destination, azcopy.creds.sas_token), flags=['--delete-destination=true'])

Having it set to true is what I need in my use case, but (a) some people may need false, and (b) false is the default in plain azcopy.

This should be added as an optional flag to az storage azcopy blob sync, and documentation should explicitly call out that the default is true.

[yonzhan]

storage