Merge branch 'fpga' into 'master'

...id5000/sites/grenoble/clusters/servan/nodes/servan-1.json

...id5000/sites/grenoble/clusters/servan/nodes/servan-2.json

data/grid5000/sites/grenoble/clusters/servan/servan.json

data/grid5000/sites/grenoble/network_equipments/gw.json

input/grid5000/ipv4.yaml

input/grid5000/sites/grenoble/clusters/servan/servan.yaml

input/grid5000/sites/grenoble/networks/gw-grenoble.yaml

input/grid5000/vlans.yaml

lib/refrepo/gen/puppet/bindg5k.rb

lib/refrepo/gen/puppet/dhcpg5k.rb

lib/refrepo/gen/puppet/templates/dhcp.erb

lib/refrepo/gen/reference-api.rb