Fix bug 17934 : Azure register failure must not be blocking (#18695)

* Fix bug 17934

* Update link in Azure provider warning log

contrib/inventory/azure_rm.py

@@ -362,7 +362,11 @@ class AzureRM(object):
             resource_client = self.rm_client
             resource_client.providers.register(key)
         except Exception as exc:
-            self.fail("One-time registration of {0} failed - {1}".format(key, str(exc)))
+            self.log("One-time registration of {0} failed - {1}".format(key, str(exc)))
+            self.log("You might need to register {0} using an admin account".format(key))
+            self.log(("To register a provider using the Python CLI: "
+                      "https://docs.microsoft.com/azure/azure-resource-manager/"
+                      "resource-manager-common-deployment-errors#noregisteredproviderfound"))
 
     @property
     def network_client(self):