Storage name does not map required file name.

In order to simplify generation, do not care yet about -instance suffix.

Zeo driven configuration is capable to generate Zope connection strings. Handle
global Zope related keys.

Turn on offline mode, reuse eggs.

They have to be passed thourght slapos.recipe.template.

Dirty fast way to instantiate ERP5: TidStorage, Zope, Zeo, haproxy, apache on
one partition.