Remove duplicated Aodh host var
Remove duplicated Aodh host var

The aodh_connection_string appears twice with an identical value.

Change-Id: I112a4b0e45fb8b089415231e28f886f46599c599

yanyao/openstack-ansible,yanyao/newton,BjoernT/os-ansible-deployment,major/openstack-ansible,Logan2211/openstack-ansible,BjoernT/openstack-ansible,jpmontez/openstack-ansible,stackforge/os-ansible-deployment,stackforge/os-ansible-deployment,os-cloud/os-ansible-deployment,weezer/openstack-ansible,BjoernT/os-ansible-deployment,cloudnull/os-ansible-deployment,bunchc/openstack-ansible,Logan2211/openstack-ansible,cfarquhar/openstack-ansible,bunchc/openstack-ansible,robb-romans/openstack-ansible,open-switch/infra_openstack-ansible,yanyao/newton,jpmontez/os-ansible-deployment,mrda/openstack-ansible,git-harry/os-ansible-deployment,yanyao/openstack-ansible,jpmontez/openstack-ansible,yanyao/openstack-deployment-liberty,yanyao/openstack-deployment-liberty,mrda/openstack-ansible,major/os-ansible-deployment,git-harry/os-ansible-deployment,robb-romans/openstack-ansible,BjoernT/openstack-ansible,jpmontez/openstack-ansible,mancdaz/openstack-ansible,BjoernT/os-ansible-deployment,git-harry/os-ansible-deployment,openstack/openstack-ansible,cfarquhar/openstack-ansible,cloudnull/os-ansible-deployment,major/os-ansible-deployment,open-switch/infra_openstack-ansible,weezer/openstack-ansible,openstack/openstack-ansible,jpmontez/os-ansible-deployment,mancdaz/openstack-ansible,mrda/openstack-ansible,open-switch/infra_openstack-ansible,jpmontez/os-ansible-deployment,major/openstack-ansible,os-cloud/os-ansible-deployment,yanyao/openstack-deployment-liberty