neutron-legacy: Remove no longer necessary vpnaas conditional

VPNaaS agent is going to be an L3 agent extention.

Related-Bug: #1692128
Depends-On: I0b86c432e4b2210e5f2a73a7e3ba16d10467f0f2
Change-Id: Id827274b7c74cdf71db6d1f2ab3eadb5fef099f5
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 0ccb17c..e2e0bb9 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -503,11 +503,7 @@
 function start_mutnauq_other_agents {
     run_process q-dhcp "$AGENT_DHCP_BINARY --config-file $NEUTRON_CONF --config-file $Q_DHCP_CONF_FILE"
 
-    if is_service_enabled neutron-vpnaas; then
-        :  # Started by plugin
-    else
-        run_process q-l3 "$AGENT_L3_BINARY $(determine_config_files neutron-l3-agent)"
-    fi
+    run_process q-l3 "$AGENT_L3_BINARY $(determine_config_files neutron-l3-agent)"
 
     run_process q-meta "$AGENT_META_BINARY --config-file $NEUTRON_CONF --config-file $Q_META_CONF_FILE"
     run_process q-metering "$AGENT_METERING_BINARY --config-file $NEUTRON_CONF --config-file $METERING_AGENT_CONF_FILENAME"