Allow uploading simple linear history with Git.

Review Request #6787 — Created Jan. 16, 2015 and submitted — Latest diff uploaded

Information

RBTools
dvcs
5c9866c...

Reviewers

The default behaviour for posting is now to determine the capabilities
of the server to see if it supports creating a review request with
commit history. The user can specify the -S/--squash-history
option or SQUASH_HISTORY config option in .reviewboardrc to
override this. However, the configuration option can itself be
overridden by the -H/--with-history flag.

Currently the only SCMClients that "supports" this flag is Git.

Add the DiffCommitResource and DiffCommitListResource resources to
the RBTools web API resources. The DiffCommitListResource handles
the uploading of commits via the upload_commit method.

Add the create_empty_diffset method to the DiffListResource class.
This method is used to create an empty DiffSet so that a review
request can be created with commit history.

Add the get_history method to the SCMClient class. This method
gets a linear history of commit metadata given some revisions.

The commit histories that can be uploaded by this change are simple
linear ones; that is, they must be linear histories (with no merges)
and diffs in commits should not overlap with respect to files.

Uploaded commits containing diffs to Review Board on the dvcs
branch.

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