Revert "Try with collective.recipe.cmd = 0.6"

This reverts commit aa503e07bd263a6b5fadfc2c52cd606d4a1deb97.

Solved in buildout.plonetest.

See: https://github.com/collective/buildout.plonetest/commit/05b23536d922eefd79f6557984d266c5fe2549a5