Removed all extension functionality from core package
diff --git a/openstack/networking/v2/subnets/requests_test.go b/openstack/networking/v2/subnets/requests_test.go
index 63e9cc2..b2b4d38 100644
--- a/openstack/networking/v2/subnets/requests_test.go
+++ b/openstack/networking/v2/subnets/requests_test.go
@@ -99,7 +99,7 @@
 						End:   "10.0.0.254",
 					},
 				},
-				HostRoutes: []interface{}{},
+				HostRoutes: []HostRoute{},
 				IPVersion:  4,
 				GatewayIP:  "10.0.0.1",
 				CIDR:       "10.0.0.0/24",
@@ -117,7 +117,7 @@
 						End:   "192.255.255.254",
 					},
 				},
-				HostRoutes: []interface{}{},
+				HostRoutes: []HostRoute{},
 				IPVersion:  4,
 				GatewayIP:  "192.0.0.1",
 				CIDR:       "192.0.0.0/8",
@@ -184,7 +184,7 @@
 			End:   "192.255.255.254",
 		},
 	})
-	th.AssertDeepEquals(t, s.HostRoutes, []interface{}{})
+	th.AssertDeepEquals(t, s.HostRoutes, []HostRoute{})
 	th.AssertEquals(t, s.IPVersion, 4)
 	th.AssertEquals(t, s.GatewayIP, "192.0.0.1")
 	th.AssertEquals(t, s.CIDR, "192.0.0.0/8")
@@ -252,7 +252,7 @@
 			End:   "192.168.199.254",
 		},
 	})
-	th.AssertDeepEquals(t, s.HostRoutes, []interface{}{})
+	th.AssertDeepEquals(t, s.HostRoutes, []HostRoute{})
 	th.AssertEquals(t, s.IPVersion, 4)
 	th.AssertEquals(t, s.GatewayIP, "192.168.199.1")
 	th.AssertEquals(t, s.CIDR, "192.168.199.0/24")