Remove redundant whitelist for DHCP agent

It looks like the whitelist for the DHCP agent is added
twice. This looks like a genuine typo, and if it isn't
there is clearly something wrong! There's no good reason
for duplicating the list of whitelisted errors.

Change-Id: Ib94f60e8aa3ce1b0a6e28d9051da0124d403bf27
diff --git a/etc/whitelist.yaml b/etc/whitelist.yaml
index e5a0d4d..a822fae 100644
--- a/etc/whitelist.yaml
+++ b/etc/whitelist.yaml
@@ -160,14 +160,6 @@
     - module: "cinder.brick.local_dev.lvm"
       message: "Can't remove open logical volume"
 
-q-dhpc:
-    - module: "neutron.common.legacy"
-      message: "Skipping unknown group key: firewall_driver"
-    - module: "neutron.agent.dhcp_agent"
-      message: "Unable to enable dhcp"
-    - module: "neutron.agent.dhcp_agent"
-      message: " Network .* RPC info call failed"
-
 ceilometer-collector:
     - module: "stevedore.extension"
       message: ".*"