vendor: update all dependencies

* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints

vendor/google.golang.org/api/servicecontrol/v1/servicecontrol-api.json

@@ -291,7 +291,7 @@
       }
     }
   },
-  "revision": "20180312",
+  "revision": "20180410",
   "rootUrl": "https://servicecontrol.googleapis.com/",
   "schemas": {
     "AllocateInfo": {
@@ -1026,7 +1026,7 @@
           "type": "string"
         },
         "resources": {
-          "description": "The resources that are involved in the operation.",
+          "description": "The resources that are involved in the operation.\nThe maximum supported number of entries in this field is 100.",
           "items": {
             "$ref": "ResourceInfo"
           },
@@ -1423,7 +1423,7 @@
     }
   },
   "servicePath": "",
-  "title": "Google Service Control API",
+  "title": "Service Control API",
   "version": "v1",
   "version_module": true
 }

vendor/google.golang.org/api/servicecontrol/v1/servicecontrol-gen.go

@@ -1,4 +1,4 @@
-// Package servicecontrol provides access to the Google Service Control API.
+// Package servicecontrol provides access to the Service Control API.
 //
 // See https://cloud.google.com/service-control/
 //
@@ -1429,6 +1429,7 @@ type Operation struct {
 	ResourceContainer string `json:"resourceContainer,omitempty"`
 
 	// Resources: The resources that are involved in the operation.
+	// The maximum supported number of entries in this field is 100.
 	Resources []*ResourceInfo `json:"resources,omitempty"`
 
 	// StartTime: Required. Start time of the operation.