Move CSIT to ccsdk/distribution repo

Move CSIT to ccsdk/distribution repo

 - move CCSDK healthcheck CSIT under distribution repository
 - add run-project-csit.sh that takes common CSIT scripts from
   integration/csit on runtime and then executes all the plans
   under distribution/csit/plans
 - use version.properties and UNIQUE_DOCKER_TAG to identify the
   docker image versions to run for testing if the latter is given,
   otherwise just choose "latest" (to enable easy local testing)
 - introduce new groovy script for tagging SNAPSHOT images only
   based on version.properties and UNIQUE_DOCKER_TAG
 - apply UNIQUE_DOCKER_TAG in dgbuilder and odlsli-alpine docker
   image versioning
 - add script for tagging snapshot images identified with
   UNIQUE_DOCKER_TAG with STAGING
 - use docker-compose for teardown instead of common kill scripts

Issue-ID: CCSDK-3017
Signed-off-by: Lasse Kaihlavirta <l.kaihlavirt@partner.samsung.com>
Change-Id: I37dcf682bf1ab77016a76adc89f5658bb0b71b19