Fix AWS GovCloud endpoint and hostedzone ID

[tosih]

The canonical hosted zone for AWS GovCloud elastic load balancers is incorrect. The endpoint is missing elb. and the hosted zone ID supplied is for Route53, and not actually for ELB.

What would you like to be added:
I would like to update the line as follows:

-		"us-gov-west-1.amazonaws.com":         "Z1K6XKP9SAGWDV",
+		"us-gov-west-1.elb.amazonaws.com":     "Z33AYJ8TM3BH4J",

Why is this needed:
This is needed otherwise you will get the following error when creating an alias for a specific ELB in us-gov-west-1.

InvalidChangeBatch: [Tried to create an alias that targets a112853ad588a48f1a2##########-##########.us-gov-west-1.elb.amazonaws.com., type A in zone Z1K6XKP9SAGWDV, but the alias target name does not lie within the target zone]