Update requirements.txt

(https://pypi.python.org/pypi/azure-mgmt-compute) : Management of Virtual Machines, etc.
(https://pypi.python.org/pypi/azure-mgmt-storage) : Management of storage accounts.
(https://pypi.python.org/pypi/azure-mgmt-resource) : Generic package about Azure Resource Management (ARM)
(https://pypi.python.org/pypi/azure-keyvault-secrets) : Access to secrets in Key Vault
(https://pypi.python.org/pypi/azure-storage-blob) : Access to blobs in storage accounts

requirements.txt

@@ -1 +1,5 @@
-azure
+azure-mgmt-compute
+azure-mgmt-storage
+azure-mgmt-resource
+azure-keyvault-secrets
+azure-storage-blob