Fix some issues after CVE fixes

[meaksh]

What does this PR do?

We've detected few issues after February CVE fixes:

• The extra_filerefs parameter is discarded for the SSHClient
• The cmd.run function crashes if passing tuple arg:

[root@suma-test-min-centos7 ~]# salt-call --local partition.mklabel /dev/vda3 msdos
[ERROR   ] An un-handled exception was caught by salt's global exception handler:
AttributeError: 'tuple' object has no attribute 'split'
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 11, in <module>
    salt_call()
  File "/usr/lib/python2.7/site-packages/salt/scripts.py", line 445, in salt_call
    client.run()
  File "/usr/lib/python2.7/site-packages/salt/cli/call.py", line 57, in run
    caller.run()
  File "/usr/lib/python2.7/site-packages/salt/cli/caller.py", line 119, in run
    ret = self.call()
  File "/usr/lib/python2.7/site-packages/salt/cli/caller.py", line 218, in call
    ret['return'] = self.minion.executors[fname](self.opts, data, func, args, kwargs)
  File "/usr/lib/python2.7/site-packages/salt/executors/direct_call.py", line 12, in execute
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/salt/modules/parted_partition.py", line 450, in mklabel
    out = __salt__['cmd.run'](cmd, python_shell=False).splitlines()
  File "/usr/lib/python2.7/site-packages/salt/modules/cmdmod.py", line 1177, in run
    **kwargs)
  File "/usr/lib/python2.7/site-packages/salt/modules/cmdmod.py", line 387, in _run
    _log_cmd(cmd),
  File "/usr/lib/python2.7/site-packages/salt/modules/cmdmod.py", line 81, in _log_cmd
    return cmd.split()[0].strip()
AttributeError: 'tuple' object has no attribute 'split'

This PR fixes these issues.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltstack.com/en/master/topics/development/changelog.html
• Tests written/updated

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Yes

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[meaksh]

@dwoz here you have it 👍

[s0undt3ch]

The failures on windows were introduced in this PR and look valid.

[meaksh]

Hey @s0undt3ch, the previously failing test for windows is a new test I've just introduced with this PR - it was not an existing one.

I've skipped it on Windows since it seems doesn't like calling echo like this. I don't have a Windows machine here to easily test this.

Do you want this test to be also implemented to run on Windows?

[s0undt3ch]

Hey @s0undt3ch, the previously failing test for windows is a new test I've just introduced with this PR - it was not an existing one

Yes, I explained myself incorrectly :)

[meaksh]

@s0undt3ch I've fixed the test for Windows.

I see now some other failures for "windows2019" and "macosxcatalina" after rebasing with master, but I think they're not related to this PR.