Run pods as non-root user

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