Remove redundant comma
Remove redundant comma

The comma in def test_direct_publisher(self, ) is redundant,
so we should remove it.

Closes-Bug: #1477869
Change-Id: I52707befa0ffd29658a39d28a93c7c24724cfe6a

idegtiarov/ceilometer,mathslinux/ceilometer,ityaptin/ceilometer,maestro-hybrid-cloud/ceilometer,openstack/ceilometer,fabian4/ceilometer,idegtiarov/ceilometer,isyippee/ceilometer,ityaptin/ceilometer,redhat-openstack/ceilometer,mathslinux/ceilometer,eayunstack/ceilometer,isyippee/ceilometer,redhat-openstack/ceilometer,maestro-hybrid-cloud/ceilometer,cernops/ceilometer,eayunstack/ceilometer,openstack/ceilometer,fabian4/ceilometer,cernops/ceilometer