Add rally coverage check and post tasks
Add rally coverage check and post tasks

As rally is quite small project (comparing to nova and neutron)
rally coverage task works quite fast, so it's not a big deal to run
it on every check.

Change-Id: I1eee92af2e4643ca4c69d5d4daf68845cb611912

anbangr/osci-project-config,coolsvap/project-config,noorul/os-project-config,open-switch/infra_project-config,citrix-openstack/project-config,anbangr/osci-project-config,osrg/project-config,citrix-openstack/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,open-switch/infra_project-config,osrg/project-config,openstack-infra/project-config,dongwenjuan/project-config,noorul/os-project-config,coolsvap/project-config,Tesora/tesora-project-config