The system is functional without simulations.

This is required for squid

Also present on others branches.

 because who setups using cluster mode should be able to run tests also :)

This change is required to expose openssl to the instance during the
Unit Tests.

Expose openssl binary to zope.

Yet another stupid commit.
Do not push local path in public repository.

Add the "http-cache": True parameter in the backend json definition to activate.

Also, stop referencing reference implicitly pulled parts.

Parameters are not final yet, and must evolve to get something resilient to
frontend "movements" (ex: frontend machine dying and frontend being
re-allocated on another, or frontend being replaced by an instance from
another software release - as it will happen for upgrades).

Modifed from original version by Rafael in order to fix conflicts
on md5 of the files and changes on same file done in multiple branches.

All Products that are not packaged as python distributions need to be placed into a "Products" package since ZEO might need to be able to import them anyway.

Also, as backward compatibility is not needed at this level, implement what
is requested in BBB comment.

This reverts commit a26dcf05.

CA-related section do not make obviously sense to be merged, so keep
them separated.