Update git submodules

Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 68830a739232e31feadc5b10c1e537197d86269f
  - Fully HTTPS support in the catalog-be

    Fully HTTPS support:
    -Updated jvm configuration to support call to
    the SDC components using HTTPS.
    -Checkstyle in the recipes
    -Add support for disableHttp flag in the chef script
    -Add support for change the http to https in the python script
    -Fixed the --schema param in the importONAPNormativeALL and
    upgradeONAPNormative python scripts
    -Checkstyle in the importX python script
    -Disabled pycurl.SSL_VERIFYHOST to fix communication with the be component

    Issue-ID: SDC-2501
    Signed-off-by: Krystian Kedron <k.kedron@partner.samsung.com>
    Change-Id: I588ba21638083694932a1af272f3bcbaa98268a7