Sanef master shall point to stabilised ERP5.

This reverts commit e620183d.

Conflicts:
	setup.py

It was misuse copied from another misue.

OpenSSL provided by SlapOS is not configured with certificates, so ignore them.

slapos.recipe.template has less dependencies than slapos.cookbook, which does
not force to compile lxml during recipe building.

Branch 'erp5' is used to work on ERP5 instantiation in SlapOS.

It is required to override-update command as section is being update.

As slapos.cookbook provides different modules it is required to correctly
select when egg is wanted and when its module selected.