Fix the E2E script

[gaearon]

It needed this commit because our git integration had a race condition. I fixed it in #3877 so now the commit ends up empty and fails. We can remove this now.

[gaearon]

Umm this breaks Windows (??)

[gaearon]

This explains it:

*** Please tell me who you are.
Run
  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"
to set your account's default identity.
Omit --global to set the identity only in this repository.
fatal: unable to auto-detect email address (got 'appveyor@APPVYR-WIN.(none)')

Git exists on the system so it lets us git init but doesn't let us git commit.