[pdus-lyon] Add pdu_outlet_power_watt metric

data/grid5000/sites/lyon/clusters/gemini/nodes/gemini-1.json

data/grid5000/sites/lyon/clusters/gemini/nodes/gemini-2.json

data/grid5000/sites/lyon/clusters/pyxis/nodes/pyxis-1.json

data/grid5000/sites/lyon/clusters/pyxis/nodes/pyxis-2.json

data/grid5000/sites/lyon/clusters/pyxis/nodes/pyxis-3.json

data/grid5000/sites/lyon/clusters/pyxis/nodes/pyxis-4.json

data/grid5000/sites/lyon/clusters/pyxis/pyxis.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-11.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-12.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-13.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-14.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-15.json

...0/sites/lyon/clusters/sagittaire/nodes/sagittaire-16.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-2.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-3.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-4.json

...00/sites/lyon/clusters/sagittaire/nodes/sagittaire-5.json

data/grid5000/sites/lyon/clusters/sagittaire/sagittaire.json

data/grid5000/sites/lyon/clusters/sirius/nodes/sirius-1.json

data/grid5000/sites/lyon/pdus/pdu3a.json