Fix errors due to repo_service_user_name setting
Fix errors due to repo_service_user_name setting

Changing the paths of nginx logs to not rely on the
 user name of repo service. This is because nginx related
 configurations, playbooks assume nginx in the directory names.

Change-Id: I2fb0ec7a2f6a1d536363d1b2056394b6534287cf
Closes-Bug: #1633739

robb-romans/openstack-ansible,os-cloud/os-ansible-deployment,Logan2211/openstack-ansible,weezer/openstack-ansible,weezer/openstack-ansible,BjoernT/os-ansible-deployment,openstack/openstack-ansible,BjoernT/os-ansible-deployment,openstack/openstack-ansible,BjoernT/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/os-ansible-deployment,cfarquhar/openstack-ansible,bunchc/openstack-ansible,Logan2211/openstack-ansible,yanyao/openstack-ansible,yanyao/openstack-ansible,bunchc/openstack-ansible,cfarquhar/openstack-ansible,cloudnull/os-ansible-deployment,BjoernT/openstack-ansible,os-cloud/os-ansible-deployment,stackforge/os-ansible-deployment,robb-romans/openstack-ansible,stackforge/os-ansible-deployment