OPNSense/core fe50e15src/opnsense/scripts/netflow flowctl_stats.py, src/opnsense/scripts/netflow/lib parse.py

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

(cherry picked from commit cf3b447275a88637e603d34eb71d34fac5c60d1e)
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+13-21src/opnsense/scripts/netflow/flowctl_stats.py
+5-7src/opnsense/scripts/netflow/lib/parse.py
+18-282 files

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