Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 3f51f0186e99e1feabef9421ab30c4554f1921f9
  - Added unit tests for FeHealthCheckServlet
    
    Improve unit test coverage in sdc/catalog-fe
    
    Issue-ID: SDC-2327
    Signed-off-by: Piotr Borelowski <p.borelowski@partner.samsung.com>
    Change-Id: Ic292318327bf23bc572b9efe72810028b2365592
    
1 file changed