op mode: T6501: add "run show kernel modules"

[dmbaturin]

Change Summary

Add a new command for listing details information about kernel modules, run show kernel modules.

The script supports displaying information about a single module, so it's possible to add a CLI for that, if we decide what to call the command.

Perhaps the command should be in run show system kernel modules, not sure.

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)

Related PR(s)

Component(s) name

Op mode.

Proposed changes

How to test

vyos@vyos:~$ show kernel modules 

Module: efi_pstore

initsize: 0
refcnt: 0
coresize: 12288
initstate: live

Parameters:

record_size: 1024
pstore_disable: N
-------------

Module: nls_ascii

initsize: 0
refcnt: 0
coresize: 12288
initstate: live

-------------
...

Smoketest result

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

[github-actions]

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PR title 'op mode: T6501: add "run show kernel modules"' does not match the required format!. Valid title example: T99999: make IPsec secure