Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to dfbc8abd0f1c151e34d07defbe0a5ff363fcf1f0
  - Sonar fix in MSOCommonBPMN

    Either log or rethrow this exception
    Remove this useless assignment to local variable "serviceInstance"
    Remove the declaration of thrown exception  which is a runtime exception
    Move the string literal on the left side of this string comparison

    Issue-ID: SO-1841
    Change-Id: I24cdd3682eddd2e5ceb7e961477a61457ef91ab2
    Signed-off-by: Parshad Patel <pars.patel@samsung.com>