Add support for testing of local SDC images

By default it is disabled and the test works as before, but by providing
the SDC_LOCAL_IMAGES variable with a value of true/yes it will not use
the upstream images (from registry) but instead the local one (in docker
cache) - they have to be build beforehand of course.

They are two more optional variables (if SDC_LOCAL_IMAGES == true/yes):
SDC_LOCAL_GITREPO .. for local git repo instead of an upstream branch
SDC_LOCAL_TAG     .. it will use local images with this docker tag

Issue-ID: SDC-2553

Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
Change-Id: Ib64ca17e81aa9c3406e0a5d8fb403f1c1b0862a1

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