firewall: T3900: T6394: remove unused import

[c-po]

Change Summary

With commit 770edf0 ("T3900: T6394: extend functionalities in firewall; move netfilter sysctl timeout parameters defined in conntrack to firewall global-opton section.") the import of the glob module is no longer required.

Found my running: make unused-imports

NOTE: No backport required as the introducing change is not (yet) part of 1.4.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T3900
• https://vyos.dev/T6394

Related PR(s)

• T3900: Add support for raw tables in firewall #3578

Component(s) name

firewall

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly