Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 0966d538f7f04dbb99e5028e09057a3e8f866cab
  - Merge "Distribution fails when no user input required in design"
  - Distribution fails when no user input required in design

    When we distribute a design from SDC and design does
    not have any user input in properties, then distribution
    fails with error ArrayIndexOutOfBoundException

    Issue-ID: SO-2279
    Signed-off-by: sarada prasad sahoo <sarada.prasad.sahoo@huawei.com>
    Change-Id: I47bd724e25d81befc09ec452aa63d8519c927520