1019155 - added logic to correctly set the URL when called from any /bindings/ URLs
updated unit tests to look for correct urls
only testing the repo_id/distributor_id suffix to circumvent a mariad of edge cases
figured out that bindings can be retrieved from a lot of different URLs, so more or less hard-coding the _href field
Merge pull request #716 from pulp/jconnor-1019155-consumer-repo-distributor-href

Jconnor 1019155 consumer repo distributor href