Upgrade lizard host system to Jessie

Originally created by @intrigeri on #11178 (Redmine)

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 tails/sysadmin#9157
stop supporting Wheezy in our Puppet modules

Edited May 15, 2020 by intrigeri