fix(deadline): fix issue in client TLS configuration for Deadline 10.1.18.5

[horsmand]

I applied a fix to this draft PR to get the integ tests to pass, so I've created a new PR from my fork.

Problem

The behavior of the ChangeRepository[SkipValidation] Deadline command in 10.1.18.5 has changed. It now clears the ProxySSLCA setting in deadline.ini before attempting to apply/validate the configuration. RFDK relied on the previous behavior where the ProxySSLCA was left unchanged.

Solution

We cannot use ChangeRepository without supplying a "client certificate" since this will disable TLS. Instead, we have switched from using ChangeRepository to instead use SetIniFileSetting ProxyRoot <RQ_ENDPOINT> . RFDK also relied on having ChangeRepository validate the connection and error if the connection settings were incorrect. We now change that validation to instead run a separate Deadline command to test the connection.

We made the same change to the Deadline configuration script that runs on the RFDK integ tests.

Testing

The RFDK integ tests are now passing using the Deadline Client 10.1.18.5 to stage the Docker recipes and the Deadline Worker Base Image Windows 10.1.18.5 2021-07-30T215517Z - ami-0d5da435a9d85896b AMI for the worker fleets.

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