Update git submodules

* Update docs/submodules/sdc/sdc-docker-base.git from branch 'master'
  to 8a3e3fc5dcc615044980586501c3a84031fc9513
  - Fixed Dockerfiles for base images
    
    Dockerfiles for building base images of sdc components fixed.
    
    Change-Id: I50057d3edba1c06e6175e5cc547981efb11ecac3
    Issue-ID: SDC-2367
    Signed-off-by: Tomasz Golabek <tomasz.golabek@nokia.com>
    
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