Repo addition to server-manager fails

closes-bug: #1383205
Issue: There was an unwanted copy into /var/www/html/contrail/images for
a repo.

Fix: removed the copy and deleteion of that file while deleting a image.

Testing: on a fresh machine first add debian-repo, make sure provisoning
is going through and delete that image.

Change-Id: I3bffb91a6201dc5ce56e6bca5d3470d7d99cac80