Set user-supplied role ARN if it was specified as an ARN on the cmdline

Author: Mike Morris

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/aws/aws-sdk-go v1.20.21
 	github.com/dustin/go-humanize v1.0.0
 	github.com/go-ini/ini v1.41.0
-	github.com/mmmorris1975/aws-config v0.2.5
+	github.com/mmmorris1975/aws-config v0.2.6
 	github.com/mmmorris1975/simple-logger v0.3.2
 	github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2
 	golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67

go.sum

@@ -13,8 +13,8 @@ github.com/go-ini/ini v1.41.0 h1:526aoxDtxRHFQKMZfcX2OG9oOI8TJ5yPLM0Mkno/uTY=
 github.com/go-ini/ini v1.41.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
-github.com/mmmorris1975/aws-config v0.2.5 h1:KTu/+lSQjepyPNRmf8l/jKzA04obUvAVuiWNPhVScmk=
-github.com/mmmorris1975/aws-config v0.2.5/go.mod h1:XxbXDEJRAhJLJdx/CjuucRHdkcsL6/DbuZc2I9PoLqM=
+github.com/mmmorris1975/aws-config v0.2.6 h1:XgekIAUt7GyDHYlYdvrUbVTSxRrz7TZaV5H5ld/Fle4=
+github.com/mmmorris1975/aws-config v0.2.6/go.mod h1:XxbXDEJRAhJLJdx/CjuucRHdkcsL6/DbuZc2I9PoLqM=
 github.com/mmmorris1975/simple-logger v0.3.2 h1:mdAIA9TP8PrABiZYr34W6w59JluivnW37UR+jotjvJU=
 github.com/mmmorris1975/simple-logger v0.3.2/go.mod h1:or6zLAgsxJ9R30hrSwa2muJEfapfwWuTt1gxI3K7cUI=
 github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2 h1:b6uOv7YOFK0TYG7HtkIgExQo+2RdLuwRft63jn2HWj8=