OPNSense/core 0ed8e37src/opnsense/scripts/systemhealth activity.py fetchData.py

python3: replace subprocess.call in src/opnsense/scripts/systemhealth/* for https://github.com/opnsense/core/issues/3574

(cherry picked from commit 83cfd4d13c2a1334f8922161723b45ea259b94be)
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+25-28src/opnsense/scripts/systemhealth/activity.py
+1-5src/opnsense/scripts/systemhealth/fetchData.py
+26-332 files

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