Handle providers that may not support managed images or disks #257
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At least one region (US Gov Iowa) doe not currently support managed images or disks. As a result, the refresh parser will blow up when it attempts to collect that information. This PR adds a check to see if the provider supports managed images and disks before attempting to collect that information. If not it simply returns an empty array.
https://azure.microsoft.com/en-us/global-infrastructure/services/
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1566600
Although the BZ listed above was originally written for Azure Stack, it applies generally.