Store staging and snapshot artifict in same repo

ONAP community is not using the a separate repo for
storing snapshot and staging artifacts. The change
parameterises the docker build to be able to separately
control the target repository and the build artifact type
(snapshot / staging). It will also store the staging and
snapshots in the same repo (10003).

Change-Id: I505023a7cdab90fa8ecfeb540f6306f0e19c3d6d
Signed-off-by: Denes Nemeth <denes.nemeth@nokia.com>
Issue-ID: VFC-728