Summary:
Previously a streaming clone would pick up the 00manifesttree.i file. This patch
adds a config to prevent that file (and other meta/ manifests) from being
transfered. The config defaults to False since Google is currently depending on
the previous behavior.
Test Plan: Add a test
Reviewers: #mercurial, quark
Reviewed By: quark
Subscribers: mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D4915481
Signature: t1:4915481:1492641427:6c8a91da4c8c6e00e23f96a93807d3c426b50532
