Update git submodules

Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Use changed_when instead of the when condition

    The 'when' condition does not make sense and it was added in order to
    avoid the ansible-lint error which requires all command or shell modules
    to use a condition. This can be avoided with changed_when as explained:

    http://willthames.github.io/2016/09/21/using-command-and-shell-in-ansible.html

    Change-Id: I36316ea0848cff9763745af6dd8d8defcd993b70
    Signed-off-by: Manuel Buil <mbuil@suse.com>