Description of problem:
Using the Mitaka-2 test repos, an all-in-one installation of packstack with 
CONFIG_LBAAS_INSTALL=y fails with the following error message:

ERROR : Error appeared during Puppet run: 192.168.122.17_neutron.pp
Error: Could not start Service[neutron-server]: Execution of '/usr/bin/systemctl start neutron-server' returned 1: Job for neutron-server.service failed because the control process exited with error code. See "systemctl status neutron-server.service" and "journalctl -xe" for details.
You will find full trace in log /var/tmp/packstack/20160127-102648-jPi06H/manifests/192.168.122.17_neutron.pp.log

/var/log/neutron/server.log shows the following error message 

2016-01-27 10:57:46.369 18043 ERROR neutron.services.service_base [-] No providers specified for 'LOADBALANCER' service, exiting
Version-Release number of selected component (if applicable):

How reproducible: always

Additional info: this seems to be related to the puppet-neutron bug described in https://bugs.launchpad.net/puppet-neutron/+bug/1535382/ . Manually adding the following line in /etc/neutron/neutron_lbaas.conf fixed the issue:


[service_providers] service_provider=LOADBALANCER:Haproxy:neutron_lbaas.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver:default