Rubicon Adapter: Switching Video Endpoint to Rubicon PBS (prebid#3610)

* updates to both the rubicon adapter and the prebid server for ORTB requirements

* updates to bid and auction data to reflect oRTB structure

* merged pbjs commits

* reverted karma conf

* always add ext.prebid.targeting.includewinners: true for openrtb

* add unit test for ext.prebid.targeting.includewinners for openrtb

* added s2sConfig 'video.ext.prebid' support and unit test

* added code comments for changes to ORTB

* handle response.ext.prebid.cache values and added unit test

* update to merged video.ext.prebid with request.ext.prebid

* update to merge includewinners

* added test for override used in s2sConfig for ext.prebid.targeting.includewinners value

* fixes for response cache logic

* added support for targeting cache props HB-3740

* added test for adserverTargeting change

* updates to address Jira ticket revision

* update to build the vastUrl object by utilizing hb_cache_host + hb_cache_path, since the hb_cache_hostpath will be suppressed soon

* removed single quotes around object literal keys to match formatting

* Splitting into a new branch

* Enforce new required params + remove legacy mediaType support

* Fixing per Eric's request

* Revert "Merge branch 'HB-3018_pbs-adapter-enhancements' of https://github.com/rubicon-project/Prebid.js into Rubicon_PBS_Video"

This reverts commit 712e566, reversing
changes made to 4f59e48.

Author: robertrmartinez