utils: T7095: make vrf and netns arguments aware of the shell

[xeluior]

Change summary

Changes the vrf and netns functionality in the utils/process.py to be aware of whether the shell is required or not. Fixes a regression they introduced that broke callers passing a list rather than a string to the popen (and family) of util functions, notably breaking the git commit-archive functionality.

I also removed the auth parameter as it was not fully implemented, was not used, was not documented, and I could not find any examples of the form it would take, making it difficult to integrate into the refactor.

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/T7095

Bug introduced in https://vyos.dev/T6975

Related PR(s)

How to test / Smoketest result

configure
set system config-management commit-archive location git://<git url>.git
commit

Prior to this patch, the commit-archive will fail with an error similar to the following.

Archiving config...
  git://<git url>.git Unable to upload "git://<git url>.git/config.boot-vyos-dev2.20250127_165226": [Errno 2] No such file or directory: " ['git', 'clone', '<git url>.git', '/tmp/git-commit-archive-0l3qtm5h/repository', '--depth=1']"
run-parts: /etc/commit/post-hooks.d/02vyos-commit-archive exited with return code 1

After this change the functionality works again.

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

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Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed