Fix errors in stop-services from missing includes

Current grenade logs show

---
Shutting down base
 ./lib/keystone: line 85: is_ssl_enabled_service: command not found
 ./lib/neutron: line 209: /lib/neutron_plugins/ml2: No such file or directory
 ./lib/neutron: line 215: /lib/neutron_plugins/services/loadbalancer: No such file or directory
 ./lib/neutron: line 221: /lib/neutron_plugins/services/metering: No such file or directory
 ./lib/neutron: line 226: /lib/neutron_plugins/services/vpn: No such file or directory
 ./lib/neutron: line 230: /lib/neutron_plugins/services/firewall: No such file or directory
 ./lib/neutron: line 233: has_neutron_plugin_security_group: command not found
 ./lib/neutron: line 946: /lib/neutron_thirdparty/*: No such file or directory
---

Sourcing the tls include should fix is_ssl_enabled_service missing,
and setting TOP_DIR for the neutron file should allow it to find the
plugin script

Change-Id: I1d1c2744d497ec8ea790d95642469069028bc3b4
Merge "Fix errors in stop-services from missing includes"