[lkgs] Use hardcoded chromeinfra auth options

This change adds the hardcoded chromeinfra auth options as the default
auth options. This lets us more easily use the tool from our local
machines.

IN-409

Change-Id: I81f34505d13cd23a2e5a3b21d861ee5676b6344f
diff --git a/Gopkg.lock b/Gopkg.lock
index aa3f853..02aaedc 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -65,6 +65,12 @@
   revision = "8c2c452e1460e1c2d42a8e3a3a527fb09bb68ee2"
 
 [[projects]]
+  branch = "master"
+  name = "github.com/mitchellh/go-homedir"
+  packages = ["."]
+  revision = "3864e76763d94a6df2f9960b16a20a33da9f9a66"
+
+[[projects]]
   name = "github.com/pmezard/go-difflib"
   packages = ["difflib"]
   revision = "792786c7400a136282c1664665ae0a8db921c6c2"
@@ -127,6 +133,7 @@
     "grpc/discovery",
     "grpc/grpcutil",
     "grpc/prpc",
+    "hardcoded/chromeinfra",
     "logdog/api/endpoints/coordinator/logs/v1",
     "logdog/api/logpb",
     "logdog/client/butlerlib/bootstrap",
@@ -273,6 +280,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "39370c0b7cbb00359f165e9371f82ef9a1e76c911b2425fbe3406ec26f6738c2"
+  inputs-digest = "0cce7557b1319b77873a7f01642ecc5f57bd2bdf77640e02b24efc42f2c6e9a3"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/cmd/lkgs/main.go b/cmd/lkgs/main.go
index b562fb3..1e35d42 100644
--- a/cmd/lkgs/main.go
+++ b/cmd/lkgs/main.go
@@ -24,6 +24,7 @@
 	"go.chromium.org/luci/auth/client/authcli"
 	buildbucketpb "go.chromium.org/luci/buildbucket/proto"
 	"go.chromium.org/luci/grpc/prpc"
+	"go.chromium.org/luci/hardcoded/chromeinfra"
 	"go.chromium.org/luci/logdog/client/coordinator"
 	"go.chromium.org/luci/logdog/common/renderer"
 	"go.chromium.org/luci/logdog/common/types"
@@ -44,7 +45,7 @@
 	flag.StringVar(&output, "output-file", "", "name of the file to write snapshot to (default is stdout)")
 
 	authFlags = authcli.Flags{}
-	authFlags.Register(flag.CommandLine, auth.Options{})
+	authFlags.Register(flag.CommandLine, chromeinfra.DefaultAuthOptions())
 }
 
 // praseBuilderID parses a builder ID of the form "fuchsia/ci/garnet-x64".