Whitelist some ext4 mount options

[Amirmohammadomidi]

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Issue Description

It would be beneficial to be able to use the commit mount option in mount_option.conf under ext4_defaults section.

Mount Options Details

commit=nrsec

The commit=nrsec option triggers a journal commit every nrsec seconds, providing control over the frequency of journal commits.

source: Linux manual page

[tbzatek]

Added, please test.