Enhancement to Show External Authentication Configuration

- Added new entry in the appliance console summary screen
to show a new "External Auth:" entry indiciating either
"not configured" or the IPA Server hostname.
- Also showing current external authentication configuration
before giving the option to unconfigure.
Add RssFeed::ImportExport.
Add specs for RssFeed::ImportExport.
Changes to MiqWidget::ImportExport to support RssFeed.
Add test cases for MiqWidget import with RssFeed.
Merge pull request #215 from lfu/rss_import_export

Support for RssFeed import/export.
Merge pull request #202 from abellotti/external_auth_summary

Enhancement to Show External Authentication Configuration