[test-infra] When updating manifest from a non-checkout put changes into local_changes section (#1446)

Instead of overwriting manifest entries when updating against a local copy (not clone) of
the tests, put differences into the local_changes section, rather than overwriting the
data about upstream. This makes resyncing changes with upstream easier.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1446

Received on Monday, 8 December 2014 17:29:55 UTC