python/samba/netcmd: Fix NameError exception

python/samba/netcmd: Fix NameError exception

Running make test TEST=samba4.drs.samba_tool_drs.python results in

BlackboxProcessError: Command '/tmp/samba-testbase/b12/samba/bin/samba-tool drs clone-dc-database samba.example.com --server=localdc -USAMBADOMAIN/Administrator%locDCpass1 --targetdir=/tmp/samba-testbase/b12/samba/bin/ab/tmp/tmpWPo8r3'; exit status 255; stdout: ''; stderr: 'ERROR(<type 'exceptions.NameError'>): uncaught exception - global name 'logging' is not defined
  File "bin/python/samba/netcmd/__init__.py", line 177, in _run
    return self.run(*args, **kwargs)
  File "bin/python/samba/netcmd/drs.py", line 697, in run
    logger.setLevel(logging.INFO)
'

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Wed Jun 20 04:08:53 CEST 2018 on sn-devel-144