Yahoo user identity module: initial release

[slimkrazy]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

All things with Verizon Media branding are shifting to the Yahoo brand. A new bid adapter is being prepared by @adam-browning and will soon be in PR, but in the meantime here is the newly branded user identity module.

The plan from the team is to first release the new Yahoo bid adapter - this will consume user ID data from the newly branded UserID module, then in a later release we will drop the old 'aol' adapter and add 'aol' as an alias of the new Yahoo bid adapter (config is the same). At this point we will also remove the old Verizon Media user identity module.

Will update this PR shortly once I open a PR for the documentation site.

[adam-browning]

LGTM 👍
FYI CircleCI test failing due to 3p adapter "SharedId"

[slimkrazy]

@ncolletti - The docs PR is now here: prebid/prebid.github.io#3334

[ncolletti]

Could you also add your module examples to the following files:

modules/userId/eids.md
modules/userId/userId.md

[slimkrazy]

@ncolletti - Any chance this PR can be checked again? With regards to the example, isn't the example found in modules/connectIdSystem.md enough?

[adam-browning]

LGTM 👍

[ncolletti]

@slimkrazy It is a small request to add examples to the remaining two markdown files. You also need to add your id module to modules/.submodules.json before this can be approved. Thank you!

[ncolletti]

LGTM