Upgrade lizard host system to Jessie

Expected outcome:

allow us to do NUMA tuning (numastat from Jessie gives per-command information, see 8.3 on https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Virtualization_Tuning_and_Optimization_Guide/index.html)
a newer libvirt + QEMU might help with #9157 (closed)
stop supporting Wheezy in our Puppet modules

Related issues

Related to #11186 (closed)
Blocks #9157 (closed)
Blocks #11179 (closed)

Original created by @intrigeri on 11178 (Redmine)

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