Rename "install" -> "get" and "update" -> "upgrade".

sdk/lib/_internal/pub/test/get/path/relative_path_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE d.file.
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("can use relative path", () {
     d.dir("foo", [
       d.libDir("foo"),
       d.libPubspec("foo", "0.0.1")
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({
         "foo": {"path": "../foo"}
       })
     ]).create();
 
-    pubInstall();
+    pubGet();
 
     d.dir(packagesPath, [
       d.dir("foo", [
         d.file("foo.dart", 'main() => "foo";')
       ])
     ]).validate();
   });
 
   integration("path is relative to containing d.pubspec", () {
     d.dir("relative", [
       d.dir("foo", [
         d.libDir("foo"),
         d.libPubspec("foo", "0.0.1", deps: {
           "bar": {"path": "../bar"}
         })
       ]),
       d.dir("bar", [
         d.libDir("bar"),
         d.libPubspec("bar", "0.0.1")
       ])
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({
         "foo": {"path": "../relative/foo"}
       })
     ]).create();
 
-    pubInstall();
+    pubGet();
 
     d.dir(packagesPath, [
       d.dir("foo", [
         d.file("foo.dart", 'main() => "foo";')
       ]),
       d.dir("bar", [
         d.file("bar.dart", 'main() => "bar";')
       ])
     ]).validate();
   });
 }