0.60.0: Sonobi Adapter (#796)

* checkpoint. I think the base openrtb is setup properly

* checkpoint. Got it compiling successfully

* added openrtb endpoint to be pulled from the config

* fixed issue where I was using a constant uri instead of from the config

* fixed issue where we were assigning tagid to the copy of the imp instad of the imp

* made it so there can be more than 1 video imp

* added sonobi user sync

* removed debugging prints

* removed unneeded declaration

* fixed a coment

* made usersync like the other bidders. but idk how this is supposed to work

* fixed }

* added tests

* updated sonobi code

* need to update our adapter now

* added Call method and updated MakeBids method

* user syncer working

* added coment explaining banner/video imp

* fix user sync test

* fixes to sonobi adapter after merge

* added support for multiple sonobi impressions

* added PubID as an imp ext

* PubID is required. updated params test

* dont need to check the PubID it is checekd earlier

* added exemplary tests to sonobi adapter

* using test endpoint

* using production endpoint for sonobi

* removed unused test file

* removed unneeded check for media types

* removed unneeded for loop.

* handle case in MakeBids getMediaTypeForBid where we cannot find the imp based off the impID in the bid response.

* removed unsed Call function. Defining the length of the imp array to 1

* fixed Content-type in exemplary test

* Removed unset headers in exemplary tests