Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 2879d63dbeecdd485394f9f35df0578040b8cf2c
  - Improve test coverage
    
    Adding more tests to improve test coverage.
    
    Issue-ID: SDC-3129
    Signed-off-by: xuegao <xg353y@intl.att.com>
    Change-Id: I23a717bfb6a0004e58ff3ca37d6dd877a956931e
    Signed-off-by: xuegao <xg353y@intl.att.com>
    
1 file changed