T6812: Fix smoketest iproute2 check

[sever-sever]

Change Summary

In the new iproute2 package, the link to ip was changed.

$ file /usr/sbin/ip
/usr/sbin/ip: symbolic link to ../bin/ip

Fix smoketest

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/T6812

Related PR(s)

Component(s) name

smoketest, iproute2

Proposed changes

How to test

Before the fix:

vyos@r14:~$ /usr/libexec/vyos/tests/smoke/system/test_iproute2.py
test_ip_is_symlink (__main__.TestIproute2.test_ip_is_symlink) ... FAIL

======================================================================
FAIL: test_ip_is_symlink (__main__.TestIproute2.test_ip_is_symlink)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/libexec/vyos/tests/smoke/system/test_iproute2.py", line 28, in test_ip_is_symlink
    self.assertEqual(os.readlink(symlink), real_file)
AssertionError: '../bin/ip' != '/bin/ip'
- ../bin/ip
? --
+ /bin/ip


----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (failures=1)

After the fix:

vyos@r14:~$ /usr/libexec/vyos/tests/smoke/system/test_iproute2.py
test_ip_is_symlink (__main__.TestIproute2.test_ip_is_symlink) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
vyos@r14:~$ 

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]

👍
No issues in PR Title / Commit Title

[github-actions]

CI integration ❌ failed!

Details

CI logs

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