multus: do not build all the args to remote exec cmd (backport #8860) (backport #8864)

[mergify]

This is an automatic backport of pull request #8864 done by Mergify.
Cherry-pick of d7b9367 has failed:

On branch mergify/bp/release-1.6/pr-8864
Your branch is up to date with 'origin/release-1.6'.

You are currently cherry-picking commit d7b93679a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   pkg/daemon/ceph/client/command_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/daemon/ceph/client/command.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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