use new zanata api to query user stats
use new zanata api to query user stats

now use one api to query user stats for
all projects.
so remove the project filter and version
filter.

Change-Id: I468d82f779555edd9756d401749f721a9979f46e

0xf2/stackalytics,openstack/stackalytics,0xf2/stackalytics,stackforge/stackalytics,0xf2/stackalytics,stackforge/stackalytics,openstack/stackalytics,openstack/stackalytics,Mirantis/stackalytics,openstack/stackalytics,0xf2/stackalytics,stackforge/stackalytics,Mirantis/stackalytics,Mirantis/stackalytics