Fix typos in dr_agent.py

This patch fixes a typo in neutron/agent/dr_agent.py.

Change-Id: I811a0489888ca6cebc1c5eee21f5b5cd8d681f3b
Signed-off-by: Taku Fukushima <tfukushima@midokura.com>
Comment out the logic for the RPCs

This patch comments the logic to retrieve advertised information of
peers and the networks.

Change-Id: Ib1658867598d085fc55b97afbde5140a323ce74f
Signed-off-by: Taku Fukushima <tfukushima@midokura.com>