Remove .testr.conf
Remove .testr.conf

This commit removes .testr.conf since this repo already has
.stestr.conf. We just need .stestr.conf instead of .testr.conf.

Change-Id: I22570efeec854d4b26ce10c6820a96349c1b625a

stackforge/monasca-common,stackforge/monasca-common,stackforge/monasca-common,openstack/monasca-common,openstack/monasca-common,openstack/monasca-common