Specify all the arguments in Jenkinsfile git method

Summary:
git <url> is the short syntax, but with other arguments, the url
parameters must be specified.

This is a follow-up for cc3b0b03bd47.

Test Plan: Build on Jenkins

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D2997