Updating amp-analytics comScore parameters

[acorretti-comscore]

• Add pageViewId (cs_pv)
• Add clientId(comScore) (c12)

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[avimehta]

You'll also need to update the tests here: https://github.com/ampproject/amphtml/blob/master/extensions/amp-analytics/0.1/test/vendor-requests.json

[acorretti-comscore]

Thanks @avimehta, I've updated the tests accordingly.
Do you prefer me to send a new PR or can you squash commits on this one?

[avimehta]

I see that you had authored the original comscore tag. Based on that, this PR looks good to me.

[avimehta]

@acorretti You don't need to squash the commits but it looks like CLA check is not passing yet. Can you go through the GoogleBot comment and see if you can resolve the CLA issue?

[acorretti-comscore]

@avimehta I did fulfill the CLA agreement in the name of comScore, Inc. to be signed by my manager Thomas Pottjegort. He signed it earlier this evening, but I don't know how to tell the GoogleBot about that.

[acorretti-comscore]

Let's see if the CLA bot can find our CLA now.

[googlebot]

CLAs look good, thanks!

[avimehta]

@acorretti Thanks for the PR!