upgrade aws-sdk to use iam-for-pods

go.mod

@@ -3,7 +3,7 @@ module github.com/kubernetes-sigs/aws-alb-ingress-controller
 require (
 	github.com/appscode/jsonpatch v0.0.0-20190108182946-7c0e3b262f30 // indirect
 	github.com/aws/aws-k8s-tester/e2e/tester v0.0.0-20190907061006-260b0e114d90 // indirect
-	github.com/aws/aws-sdk-go v1.16.35
+	github.com/aws/aws-sdk-go v1.23.21
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/go-logr/glogr v0.1.0
 	github.com/go-logr/logr v0.1.0 // indirect

go.sum

@@ -9,6 +9,8 @@ github.com/aws/aws-k8s-tester/e2e/tester v0.0.0-20190907061006-260b0e114d90 h1:F
 github.com/aws/aws-k8s-tester/e2e/tester v0.0.0-20190907061006-260b0e114d90/go.mod h1:xCa3ZGICI7/IqtJdYjEsM3QL9vwlLHxgwSA/MD09Zgo=
 github.com/aws/aws-sdk-go v1.15.39/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZoCYDt7FT0=
 github.com/aws/aws-sdk-go v1.16.35/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.23.21 h1:eVJT2C99cAjZlBY8+CJovf6AwrSANzAcYNuxdCB+SPk=
+github.com/aws/aws-sdk-go v1.23.21/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/blang/semver v3.5.1+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=