Vendor: update OpenStack floatingips

Fetch latest version of the Gophercloud Neutron floatingips package and
sort vendor.json.

vendor/vendor.json

@@ -761,6 +761,12 @@
 			"revision": "95a28eb606def6aaaed082b6b82d3244b0552184",
 			"revisionTime": "2017-06-23T01:44:30Z"
 		},
+		{
+			"checksumSHA1": "lW+ldKF07Zz/C7WYPTchfr1USrQ=",
+			"path": "github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/attachinterfaces",
+			"revision": "00dcc07f1071d5f96520fac7a2b9a30eabccf879",
+			"revisionTime": "2018-06-10T02:06:14Z"
+		},
 		{
 			"checksumSHA1": "kCHEEeRVZeR1LhbvNP+WyvB8z2s=",
 			"path": "github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/bootfromvolume",
@@ -773,12 +779,6 @@
 			"revision": "7112fcd50da4ea27e8d4d499b30f04eea143bec2",
 			"revisionTime": "2018-05-31T02:06:30Z"
 		},
-		{
-			"checksumSHA1": "lW+ldKF07Zz/C7WYPTchfr1USrQ=",
-			"path": "github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/attachinterfaces",
-			"revision": "00dcc07f1071d5f96520fac7a2b9a30eabccf879",
-			"revisionTime": "2018-06-10T02:06:14Z"
-		},
 		{
 			"checksumSHA1": "lAQuKIqTuQ9JuMgN0pPkNtRH2RM=",
 			"path": "github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/keypairs",
@@ -848,8 +848,8 @@
 		{
 			"checksumSHA1": "K4VAatvB/jywsU+g/mU7bnSaVaI=",
 			"path": "github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/layer3/floatingips",
-			"revision": "00dcc07f1071d5f96520fac7a2b9a30eabccf879",
-			"revisionTime": "2018-06-10T02:06:14Z"
+			"revision": "83835c772d1adf71e8df7440d5da9ad039dc049e",
+			"revisionTime": "2018-08-15T02:05:10Z"
 		},
 		{
 			"checksumSHA1": "XEVvG2f/dqATN4aCluZlPylW+9A=",