Add support for configuring oauth templates.

Allow users who wish to deploy configs with ansible to define templates for
oauth screens, and control the alwaysShowProviderSelection setting.

There are currently three supported oauth templates, and we have a pre-existing
'oauth_template' variable, but it is assumed to mean you are controlling the
'login' screen, and this is the only one you can configure.

To work around this, supporting all current and future templates, introduce a
pluralized variable 'oauth_templates', which contains a JSON dict allowing the
admin to control any template they wish. If both new and old variables are
defined, the old one is ignored. (and can be considered deprecated)

Internally the old value will be converted to the new dict, so the template
just references one value.

Example:

openshift_master_oauth_always_show_provider_selection=true
openshift_master_oauth_templates={"providerSelection": "provider-selection.html", "error": "oauth-error.html"}

Yeilds:

oauthConfig:
  alwaysShowProviderSelection: true
  templates:
    error: oauth-error.html
    providerSelection: provider-selection.html

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