Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Bugfix: Permission denied when pip install virtualenv
    
    JIRA: DOVETAIL-420
    
    Collecting virtualenv
    Downloading virtualenv-15.1.0-py2.py3-none-any.whl (1.8MB)
    Installing collected packages: virtualenv
    Exception:
    Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
    File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 308, in run
    strip_file_prefix=options.strip_file_prefix,
    File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 646, in install
    **kwargs
    File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 816, in install
    strip_file_prefix=strip_file_prefix
    File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 1013, in move_wheel_files
    strip_file_prefix=strip_file_prefix,
    File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 339, in move_wheel_files
    clobber(source, lib_dir, True)
    File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 317, in clobber
    shutil.copyfile(srcfile, destfile)
    File "/usr/lib64/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
    IOError: [Errno 13] Permission denied: '/usr/lib/python2.7/site-packages/virtualenv.py'
    
    Change-Id: I7c387013739252402fa3774b1a2df241a09f24c0
    Signed-off-by: xudan <xudan16@huawei.com>
    

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