erp5testnode: add slapos.cookbook dependencies.

Explicitely list them, because develop egg doesn't not guarantee respect of dependencies.
KVM: new parameter: number of resiliency backups.
resiliency stack: define different notifier port for importer and exporter.

Allow to run inside of a slapproxy w/ all partitions using same IP.
kvm SR: use same clone amount parameter name than already implemented in slaprunner.
slapos stack: use slapos.core 1.3.0.
slapos stack: use slapos.core 1.3.1.
Merge remote-tracking branch 'origin/master' into erp5testnode
version up : file 5.20.
fixup! slapos stack: use slapos.core 1.3.1.