/reviewed-by: TrustMe

lab.nexedi.com is now our main domain for git hosting.
lab.nexedi.cn continues to work for backward-compatibility reasons.

/reviewed-by: TrustMe

slapos.core.git moved to lab.nexedi.cn and repository on git.erp5.org
made readonly. Update all referenced to old repository location:

    http://git.erp5.org/repos/slapos.core.git

->

    https://lab.nexedi.cn/nexedi/slapos.core.git

/reviewed-by trustme

90Gb

Section "KVM instance (1GB of RAM, 10GB of SSD, one core)" was put there
twice with exactly the same text.

Remove duplicate.

/reviewed-by TrustMe
/cc @alain.takoudjou

text content is saved in a file called 'data' of the corresponding http server. the file can be downloaded into the vm with:
- https://10.0.2.101/FOLDER_HASH/data : if parameter 'cluster-data' is used (for kvm-cluster only, file is accessible from all vm)
- http://10.0.2.100/data : if parameter 'data-to-vm' is used.

A new recipe deploy a python HTTPServer which is used to share files between all vm in the cluster
the url is something like: https:IPv6:port/HASH-PATH/FILES
Access to root https:IPv6:port/ is forbiden.

- publish ipv4 after allocation
- fix computer_guid for cluster allocation