Backed out - Pinning for Mozharness is enabled for the fx-team integration tree

EDIT=We had to back out this change since it caused issues for PGO talos jobs. We will try again after further testing.

Pinning for Mozharness [1] has been enabled for the fx-team integration tree.
Nothing should be changing. This is a no-op change.

We're still using the default mozharness repository and the "production" branch is what is being checked out. This has been enabled on Try and Ash for almost two months and all issues have been ironed out. You can know if a job is using pinning of Mozharness if you see "repostory_manifest.py" in its log.

If you notice anything odd please let me know in bug 1110286.

If by Monday we don't see anything odd happening, I would like to enable it for mozilla-central for few days before enabling it on all trunk trees.

Again, this is a no-op change, however, I want people to be aware of it.

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This work by Zambrano Gasparnian, Armen is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.