Adapt acme challenge script for rdu3

CentOS Infra issue/request

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Issue Type

• [] Issue - problem with something that was working
• [] Feature Request - something you'd like us to add/modify/change
• Task - mostly used by CentOS Infra team for day-to-day operations or bigger plans

Description

Post dc-move tasks : while almost all our tls certs are using dns-challenge method for acme protocol, there are some specific hosts which were using http-challenge, and so also redirect to a host that doesn't exist anymore (rdu2). We need to just fix this for rdu3