fix setup from a tarball again

this makes the following work again.

    DIR=$(mktemp -d)
    git archive --format=tar HEAD | (cd ${DIR} && tar xf -)
    cd ${DIR}
    python ./setup.py install

PBR_VERSION environment variable didn't work as we expected
because it unconditionally overrides versions for other packages
even if there are other ways to get their versions.  eg. PKG_INFO.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

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