container: T6406: fix NameError: name 'vyos' is not defined (backport #3547)

[mergify]

Change Summary

Commit 7491056 ("T6406: rename cpus to cpu") did not import the function from the Python module. @nvollmar

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/container.py", line 490, in <module>
    verify(c)
  File "/usr/libexec/vyos/conf_mode/container.py", line 132, in verify
    cores = vyos.cpu.get_core_count()
            ^^^^
NameError: name 'vyos' is not defined

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/T6406

Related PR(s)

• T6406: Container CPU limits #3530

Component(s) name

container

Proposed changes

How to test

Smoketest result

vyos@vyos:~$ /usr/libexec/vyos/tests/smoke/cli/test_container.py
test_basic (__main__.TestContainer.test_basic) ... ok
test_cpu_limit (__main__.TestContainer.test_cpu_limit) ... ok
test_dual_stack_network (__main__.TestContainer.test_dual_stack_network) ... ok
test_ipv4_network (__main__.TestContainer.test_ipv4_network) ... ok
test_ipv6_network (__main__.TestContainer.test_ipv6_network) ... ok
test_uid_gid (__main__.TestContainer.test_uid_gid) ... ok

----------------------------------------------------------------------
Ran 6 tests in 114.165s

OK

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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This is an automatic backport of pull request #3547 done by [Mergify](https://mergify.com).