Update git submodules

Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to a2abf6ea18d512d367277bacaf7476754dc0eff5
  - Run pods as non-root user

    Summary of changes:
    sdc-cassandra-init
    	Added user sdc (in base image base_sdc-cqlsh - https://gerrit.onap.org/r/103436)
    	Run entrypoint as user sdc
    	Moved relevant files from /root/ to /home/sdc/

    sdc-backend-init
    	Added user sdc (in base image base_sdc-python - https://gerrit.onap.org/r/103436)
    	Run entrypoint as user sdc
    	Moved relevant files from /root/ to /home/sdc/

    sdc-backend
    	Run entrypoint as user jetty
    	Moved relevant files from /root/ to /var/lib/jetty/
    	Moved cadi & cert files from /opt/app/jetty to /var/lib/jetty/
    	Moved ready_probe from /var/lib/read-probe.sh to /var/lib/jetty/read-probe.sh

    sdc-frontend
    	Run entrypoint as user jetty
    	Moved relevant files from /root/ to /var/lib/jetty/
    	Moved ready_probe from /var/lib/read-probe.sh to /var/lib/jetty/read-probe.sh

    sdc-onboard-backend-docker
    	Run entrypoint as user jetty
    	Moved relevant files from /root/ to /var/lib/jetty/
    	Moved ready_probe from /var/lib/read-probe.sh to /var/lib/jetty/read-probe.sh

    sdc-onboard-db-init-docker
    	Run entrypoint as user sdc
    	Added user sdc (in base image base_sdc-cqlsh - https://gerrit.onap.org/r/103436)
    	Moved relevant files from /root/ to /home/sdc/

    Signed-off-by: MichaelMorris <michael.morris@est.tech>
    Issue-ID: SDC-2798
    Change-Id: I85be320a4a5e1cc5aeebbb98c4484d5d6fd06dfc