Provide a username and email when running `git merge --squash`
Summary:
Ref T182. This command should never actually generate a commit because `--squash` prevents that, but `git` seems to sometimes hit a check for username/email configuration (maybe when merging a non-fastforward?).
Give it some dummy values to placate it. This command shouldn't commit anything so these values should never actually be used.
Test Plan: Landed rGITTESTd8c8643cb02bbe60048c6c206afc2940c760a77e.
Reviewers: chad, Mnkras
Reviewed By: Mnkras
Maniphest Tasks: T182
Differential Revision: https://secure.phabricator.com/D14347
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