tools: fix zebra support bundle commands

CI constantly fails to execute "show zebra fpm stats":
```
Execute: show zebra fpm stats
Traceback (most recent call last):
  File "/usr/lib/frr/generate_support_bundle.py", line 55, in executeCommand
    cmd_output = subprocess.check_output(cmd_exec_str, shell=True)
  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command 'vtysh -c "show zebra fpm stats" ' returned non-zero exit status 1.
```

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

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