[PATCH] zorg: jenkins: Rewrite 'derive' to be more flexible

[Duncan P. N. Exon Smith]

This patch series adds a `derive-llvm+clang` command to the
Jenkins build.py.

  - 0001: Refactor `derive()` and `derive_lldb()` to share
    code and stop hardcoding expectations.  Although the
    exact rsync commands will change slightly (with some
    redundant excludes), there should be no effective
    functionality change.

    @Sean: you might want to check the `lldb`-related logic.
    If you want I can leave `derive_lldb()` just as I found
    it; maybe it's not valuable to share code there.

  - 0002: Change `check_repo_state()` to log what it finds
    instead of giving an error when something is missing.

    IMO, the sanity check only provides value on builders
    that aren't mature.  Builders that are "working" should
    fail in the "acquire" step.  Logging what's going on
    seems sufficient.

    Another approach would be to thread the set of repos
    through the `build()` step, but I think that would be
    pretty awkward.

  - 0003: Add `derive-llvm+clang()`.

The end goal is to enable Jenkins to checkout just llvm and
clang for a faster incremental builder.

(I didn't find any tests... did I miss them somewhere?)

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