952310 - support file:// urls.
add comment.
fix comment.
revert import arrangement.
verify downloaded file and error report.
Merge pull request #440 from pulp/jortel-952310

952310, file:// URLs in pyCurl downloader
Improved summary/error reporting; validation and synchronization flows.
Merge branch 'master' into nodes_reporting_2.2.0
Fix unit tests.
Fix node update rendering to match report.  Add unit tests.
Fix requires on python-eventlet.
Merge branch 'master' into nodes_reporting_2.2.0
Move RepositoryReport to common.
docstring updates.
Map error descriptions in the renderer.