Remove ZFS-related tunable from create_cfg.py

[ericbsd]

Summary by Sourcery

Bug Fixes:

• Remove conditional block that appended 'vfs.zfs.arc.sys_free' setting to /boot/loader.conf

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR simplifies create_cfg.py by removing the ZFS ARC sys_free tunable injection logic that appended a configuration line to /boot/loader.conf when zfs support was enabled.

Class diagram for updated configuration logic in create_cfg.py

classDiagram
    class CreateCfg {
        __init__()
        # Removed: zfs ARC sys_free tunable injection
    }

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File-Level Changes

Change	Details	Files
Remove ZFS ARC sys_free tunable write logic	Deleted the conditional check for zfs flag Removed definition of the zfs_arc command Erased the runCommand write invoking zfs_arc	src/create_cfg.py

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