[Pybots] Separating 2.5 and trunk?

[skip at pobox.com]

    Skip> Isn't it possible that the 2.5 and trunk slaves will be running at
    Skip> the same time?

    Sidnei> Nope. The master configuration uses a 'slave lock' to prevent
    Sidnei> that.

That's good to know.  It still seems that /tmp/python-buildbot/local should
be rm-rf'd at some point (probably when make distclean is run) to avoid any
crosstalk between Python versions though.

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