Submodule improvements

[Jelmer Vernooij]

This patchset improves our handling of submodules in our build system,
by preventing developers build with outdated submodules if there are
any present. This should hopefully address the concerns that Andrew
raised in the last thread.

While I was there, I also removed support for running Samba from a
bzr repository rather than Git. I'm pretty sure I was the only who
ever used that.

Cheers,

Jelmer
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