Issue

• neutron::agents:l3::extensions changes configuration under AGENT section instead of agent section

# grep -i -A 28 '\[agent\]' /var/lib/config-data/puppet-generated/neutron/etc/neutron/l3_agent.ini | egrep -v -e '^$'
[agent]
#
# From neutron.az.agent
#
# Availability zone of this node (string value)
#availability_zone = nova
#
# From neutron.base.agent
#
# Seconds between nodes reporting state to server; should be less than
# agent_down_time, best if it is half or less than agent_down_time. (floating
# point value)
#report_interval = 30
# Log agent heartbeats (boolean value)
#log_agent_heartbeats = false
#
# From neutron.l3.agent
#
# Extensions list to use (list value)
#extensions =
--
[AGENT]
extensions=fip_qos