Add tests to assert filter validation

Add test cases to pass valid and invalid filters to server.
If a valid filter is passed, assert server returns the correct
list of resources. If an invalid filter is passed, assert
server returns a 400 response.

Change-Id: I2b8baa93a5587fa036a8a8ab124c216d2dba4444
Related-Bug: #1749820
diff --git a/.zuul.yaml b/.zuul.yaml
index 4ee5572..1f8c71e 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -16,7 +16,7 @@
       tox_envlist: all
       devstack_localrc:
         TEMPEST_PLUGINS: /opt/stack/neutron-tempest-plugin
-        NETWORK_API_EXTENSIONS: address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,dvr,empty-string-filtering,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-mac-address-regenerate,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-segment,standard-attr-timestamp,standard-attr-tag,subnet_allocation,trunk,trunk-details
+        NETWORK_API_EXTENSIONS: address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,dvr,empty-string-filtering,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,filter-validation,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-mac-address-regenerate,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-segment,standard-attr-timestamp,standard-attr-tag,subnet_allocation,trunk,trunk-details
       devstack_plugins:
         neutron: git://git.openstack.org/openstack/neutron.git
         neutron-tempest-plugin: git://git.openstack.org/openstack/neutron-tempest-plugin.git
@@ -132,7 +132,7 @@
     vars:
       devstack_localrc:
         Q_AGENT: linuxbridge
-        NETWORK_API_EXTENSIONS: address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-timestamp,standard-attr-tag,subnet_allocation,tag,tag-ext,trunk,trunk-details
+        NETWORK_API_EXTENSIONS: address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,filter-validation,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-timestamp,standard-attr-tag,subnet_allocation,tag,tag-ext,trunk,trunk-details
       devstack_local_conf:
         post-config:
           $NEUTRON_CONF: