Move error down to a warn when we can't bind AWS or TF

It was previously uncaught, so this is still an improvement.

And it makes a massive assumption about how stuff is configured anyway,
so needs refactoring at some point

cmd/terraform.go

@@ -49,11 +49,11 @@ Examples:
 		task.AddEnv("AWS_PROFILE", cli.FlagValues().GetString("aws-profile"))
 		err := creds.BindAWS(t, args)
 		if err != nil {
-			log.Fatalf("Could not bind AWS dir: %v", err)
+			log.Warnf("Could not bind AWS dir: %v", err)
 		}
 		err = creds.BindTerraform(t, args)
 		if err != nil {
-			log.Fatalf("Could not bind Terraform dir: %v", err)
+			log.Warnf("Could not bind Terraform dir: %v", err)
 		}
 
 		// For terraform init only, download custom plugins, if any