Summary:
This diffs add a `getmeta` method to all content stores. The cdatapack code is
modified to pass the tests, it needs further change to support `getmeta`.
The datapack format is bumped to v1 from v0. For v1, we append a `metadata`
dict at the end of each revision. The dict is currently used to store revlog
flags and rawsize of raw revlog fulltext. In the future we can put more data
like a second hash etc, without changing API or format again.
This diff focuses on correctness. A datapack caching layer to speed up
`getmeta` will be added later.
Tests are updated since we write new v1 packfile now and the format change
leads to different content and packfile names.
`Makefile`, `ls-l.py` are added to make tests easier to maintain.
Test Plan: Updated existing tests.
Reviewers: #mercurial, rmcelroy, durham
Reviewed By: durham
Subscribers: rmcelroy, mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D4903917
Signature: t1:4903917:1493255844:7ef5d487096cd2f78f2aaae672a68d49f33632ee
