Update git submodules

Update git submodules

* Update docs/submodules/ccsdk/cds.git from branch 'master'
  to 856021afc2b0a8260fa2f498b7bc17b55a0f4b0a
  - Merge "Python executor: Execution command and prepare environment log Also fix error messages return when something goes wrong."
  - Python executor: Execution command and prepare environment log
    Also fix error messages return when something goes wrong.

    Issue-ID: CCSDK-1404
    Signed-off-by: Steve Siani <alphonse.steve.siani.djissitchi@ibm.com>
    Change-Id: Ifff396d8cee8d6608b6fb32d3a8e941a253ba24c