Add keystoneauth1 in requirements
Add keystoneauth1 in requirements

We move to the new keystoneauth1 library, but there is no keystoneauth1
in keystoneclient==1.6.0

Change-Id: I7f4ff7c4ed0d8d14fb3a0ec555a5ba37cf375abd

openstack/ceilometer,ityaptin/ceilometer,idegtiarov/ceilometer,idegtiarov/ceilometer,openstack/ceilometer,ityaptin/ceilometer