Add config for esnode7

Refs. sysadm-environment#4759

configs/esnode7.yaml

+---
+VLAN_ID: 440
+IPADDRESS: 192.168.100.64
+NETMASK: 255.255.255.0
+GATEWAY: 192.168.100.1
+NAMESERVER: 192.168.100.29
+HOSTNAME: esnode7
+DOMAINNAME: internal.softwareheritage.org
+DEPLOYMENT: production
+SUBNET: sesi_rocquencourt
+BOOT_DISK_ID_PATTERN: "*_Boot_Controller_*"