@rafael says frontend infrastructure is not yet ready to handle slave
requests for frontends which come with lab.nexedi.com frontend SR URLs.

So revert apache-frontend-URL related part of 86deb9c6 (*: slapos.git
moved to https://lab.nexedi.com/nexedi/slapos.git) back for now.

/cc @jp
/reviewed-by @rafael
/reviewed-on !52

This updates links to slapos.git in the tree to point to new location.

We do so whole-tree except one place in stack/monitor/ :

    [download-monitor-static]
    recipe = hexagonit.recipe.download
    url = http://git.erp5.org/gitweb/slapos.git/snapshot/930be99041ea26b7b1186830e5eb56ef0acc1bdf.tar.gz
    ...

(see d8800c0b "monitor: Download statics files from snapshot")

The reason we do not update that link yet, is that 930be99041ea26b7b1186830e5eb56ef0acc1bdf
is a tree object and gitlab does not allow to dowload tree object as archives (yet ?)

So for now that link stays unconverted - and we'll think how to do with it.

Decouple ip/port from apache-php section so that we actually can request the frontend before deploying apache.

Was only used for specific demo.

Fix aac29aa6.
parts+= *is* *a* *nightmare*.

This reverts commit daeeae60.

This reverts commit daeeae60.

This is a squash merge of 'resiliency-testing' branch when
the HEAD of this branch was f725c81d7d69.

The merge was done by Antoine Catton.