Class and instance connect/verify use competely different code paths

[agrare]

The code used to verify credentials via DDF forms for create/edit actions is completely different from the code used after the provider is created.

This inconsistency means it is possible for one to pass and another to fail.

Class-level connect: https://github.com/ManageIQ/manageiq-providers-openstack/blob/master/app/models/manageiq/providers/openstack/manager_mixin.rb#L36-L61
Instance-level connect: https://github.com/ManageIQ/manageiq-providers-openstack/blob/master/app/models/manageiq/providers/openstack/manager_mixin.rb#L186-L188

[miq-bot]

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