Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Create unit tests for 'cleanup.py' module
    
    This is the first attempt to add unit testing capabilities
    to OPNFV/SFC project.
    
    Also we are following the contraints.txt logic which
    helps in the direction of simulating a test env which
    will be as much as close to the real env that the SFC
    testcases are running.
    
    Jira: SFC-127
    Jira: SFC-129
    
    Change-Id: I938d28f9f85614cdefa163949c4ec9f06f5d27b4
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>
    

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