Update git submodules

* Update hacking from branch 'master'
  to 634cb78484a9c58f067c2df8cba7f49458c82043
  - Ignore SyntaxError exceptions
    
    We parse 'logical_line's in a couple of extensions. There is currently a
    potential bug in flake8 [1] that means these lines are not valid Python.
    While we wait on a fix, simply skip these lines.
    
    [1] PyCQA/flake8#1948
    
    Change-Id: Ia0f2d729ee48f85afaa58ddb6e983e12d4f298a2
    Signed-off-by: Stephen Finucane <[email protected]>