Fix for broken azure requirements

Older setuptools does not understand ~= versioning.  Guess at a range
that could be compatible to unbreak CI.

packaging/requirements/requirements-azure.txt

@@ -1,12 +1,12 @@
-azure-mgmt-compute~=2.0.0
-azure-mgmt-network~=1.3.0
-azure-mgmt-storage~=1.2.0
-azure-mgmt-resource~=1.1.0
-azure-storage~=0.35.1
-azure-cli-core~=2.0.12
-msrestazure~=0.4.11
-azure-mgmt-dns~=1.0.1
-azure-mgmt-keyvault~=0.40.0
-azure-mgmt-batch~=4.1.0
-azure-mgmt-sql~=0.7.1
-azure-mgmt-web~=0.32.0
+azure-mgmt-compute>=2.0.0,<3
+azure-mgmt-network>=1.3.0,<2
+azure-mgmt-storage>=1.2.0,<2
+azure-mgmt-resource>=1.1.0,<2
+azure-storage>=0.35.1,<0.36
+azure-cli-core>=2.0.12,<3
+msrestazure>=0.4.11,<0.5
+azure-mgmt-dns>=1.0.1,<2
+azure-mgmt-keyvault>=0.40.0,<0.41
+azure-mgmt-batch>=4.1.0,<5
+azure-mgmt-sql>=0.7.1,<0.8
+azure-mgmt-web>=0.32.0,<0.33