Provide backward compatiblity for old style method.
Thanks to partially reverting "Use only externally provided buildout." (commit 2a0bbcc9) it is possible to use slapgrid with provided buildout binary, but no one is forced to follow this way, as old style internal bootstraping procedure is available. Conflicts, manually merged: slapos/grid/slapgrid.py slapos/grid/utils.py
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