Zope listen on ipv4.
Add ipv6 tunneling to access zeo, tidstorage.
Add ipv6 tunneling to provide external access to the zope.

ZEO servers listen on ipv4.
Always instanciate tidstorage.
Add ipv6 tunnels to provide external access to zeo and tidstorage.
Add promises.

Tidstorage directly connects to the zeo servers.

Conflicts:
	software/erp5/software.cfg

Component used are 6tunnel and haproxy.

http://toxygen.net/6tunnel/

This reverts commit 11150b66.

Hack was needed in damaged environment, which did not managed to have correct
symlinks.

On some platforms it is required.

If multiple calls manage_addERP5Site are done in parallel by this script,
it cause conflict error during site creation.

1.3.0 has building process which has been found to be cumbersome on some platforms.

Only check if cloudooo and openoffice port is listenning.

This definition is present already into a more appropriate place, on
erp5-promise.

The erp5 is created by erp5-bootstrap, this promise assert if the site
is already created.

Conflicts:
	software/erp5/software.cfg