default_aggregation_methods configuration worked in gnocchi-upgrade
default_aggregation_methods configuration worked in gnocchi-upgrade

We need set the default_aggregation_methods when config file is
loaded.

Change-Id: Id25372eb7faf206fe9b526205967d6f14f0b3373
Closes-Bug: #1680740

leandroreox/gnocchi,leandroreox/gnocchi,gnocchixyz/gnocchi,sileht/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi