Add "httpchk /versions" for glance-api haproxy.
Add "httpchk /versions" for glance-api haproxy.

With the default httpchk, glance-api always show warning in the logs
"WARNING glance.api.middleware.version_negotiation [..] Unknown version.
Returning version choices", with the /versions added, there is no
warning in the log.

Change-Id: I086cb23c30b9e3ddc5eac68cba42d03ed907138c

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