Replaces copied OCM config with ocm-common config

[iamkirkbater]

!!!!

Requires openshift-online/ocm-common/pull/78 to be merged before this will work.

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This replaces our current copied OCM config loading with a common OCM config loader. This should fix keychain issues and other config loading related issues, and is the first step towards being able to have regional OCM support.

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