slapos.cookbook test: use environment variables to pass eggs directories
slapos.cookbook recipe tests sometimes manipulate buildout eggs working set, which will install packages from pypi. makeRecipe utilty function was guessing buildout egg folders by parsing builout.cfg, but since a33844a2 (slapos-testing, slapos-sr-testing: Don't duplicate instance.cfg prologue that is already provided by stack/nxdtest/instance.cfg, 2021-03-22), these are defined in an extended profile, so this stopped working. Instead of this fragile pattern, make the test software release pass the eggs directories with an explicit environment variable.
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