Remove psutil.error module imports in utah for utopic

Remove the references for psutil.error module in utah since the utopic verion of python-psutil ( 2.1.1-1), psutil.error is deprecated.

For more info

http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/utopic/python-psutil/utopic/revision/20

and

2014-06-01 20:17:44,718 ssh DEBUG: Connecting SSH
2014-06-01 20:17:44,887 ssh DEBUG: Opening SSH session
2014-06-01 20:17:45,121 ssh INFO: Running command through SSH: utah -f yaml -r /tmp/default.run -o /var/lib/utah/utah.out
2014-06-01 20:17:45,376 ssh DEBUG: Closing SSH connection
2014-06-01 20:17:45,377 ssh WARNING: SSH command (utah -f yaml -r /tmp/default.run -o /var/lib/utah/utah.out) failed with return code: 1
2014-06-01 20:17:45,377 ssh DEBUG: Standard output follows:
2014-06-01 20:17:45,377 ssh DEBUG: Standard error follows:
2014-06-01 20:17:45,378 ssh DEBUG: Traceback (most recent call last):
2014-06-01 20:17:45,378 ssh DEBUG: File "/usr/bin/utah", line 27, in <module>
2014-06-01 20:17:45,378 ssh DEBUG: from utah.url import url_argument
2014-06-01 20:17:45,379 ssh DEBUG: File "/usr/lib/python2.7/dist-packages/utah/url.py", line 36, in <module>
2014-06-01 20:17:45,379 ssh DEBUG: from utah.cleanup import cleanup
2014-06-01 20:17:45,379 ssh DEBUG: File "/usr/lib/python2.7/dist-packages/utah/cleanup.py", line 30, in <module>
2014-06-01 20:17:45,379 ssh DEBUG: from utah.process import ProcessRunner
2014-06-01 20:17:45,380 ssh DEBUG: File "/usr/lib/python2.7/dist-packages/utah/process.py", line 30, in <module>
2014-06-01 20:17:45,380 ssh DEBUG: import psutil.error
2014-06-01 20:17:45,380 ssh DEBUG: ImportError: No module named error

================================
This eventually leading to the console log:
2014-06-01 20:17:07,894 rsyslog WARNING: Expected pattern missed, matched future pattern: .*Machine UUID:\s+(.*)
2014-06-01 20:17:45,377 ssh WARNING: SSH command (utah -f yaml -r /tmp/default.run -o /var/lib/utah/utah.out) failed with return code: 1
Unhandled error in UTAH:
Traceback (most recent call last):
  File "/usr/bin/run_utah_tests.py", line 128, in <module>
    exitstatus = timeout(config.jobtimeout, run_utah_tests)
  File "/usr/lib/python2.7/dist-packages/utah/timeout.py", line 65, in timeout
    return command(*args, **kw)
  File "/usr/bin/run_utah_tests.py", line 117, in run_utah_tests
    exitstatus, locallogs = run_tests(args, _get_machine(args))
  File "/usr/lib/python2.7/dist-packages/utah/run.py", line 345, in run_tests
    _write(machine, args, locallogs, remote_path)
  File "/usr/lib/python2.7/dist-packages/utah/run.py", line 282, in _write
    machine.downloadfiles(report_remote_path, report_local_path)
  File "/usr/lib/python2.7/dist-packages/utah/provisioning/ssh.py", line 257, in downloadfiles
    sftp_client.get(remotepath, localpath)
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 673, in get
    file_size = self.stat(remotepath).st_size
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 337, in stat
    t, msg = self._request(CMD_STAT, path)
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 689, in _request
    return self._read_response(num)
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 736, in _read_response
    self._convert_status(msg)
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 762, in _convert_status
    raise IOError(errno.ENOENT, text)
IOError: [Errno 2] No such file