Remove unused neutron variable definition
Remove unused neutron variable definition

Removing neutron_galera_password variable in roles/os_neutron/defaults/main.yml
which has never been used. In fact,  all related password variables are defined in
etc/openstack_deploy/user_secrets.yml.

Change-Id: I460215d4e10f13b1dc3f7504d3914d4e84862adb

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