Move SDNC and PNFSim into docker-compose for CSITs

Move SDNC and PNFSim into docker-compose for CSITs

To improve reliability of healthchecks in CSITs, they are implemented
in docker-compose. This commit moves SDNC and dependencies into main
docker-compose and adds healthchecks to them. This improves the CSIT
in that tests will quickly fail if SDNC or PNFsim containers fail to
start (currently tests run anyway even if containers are not ready).

- Move SDNC, MariaDB and PNFSim containers to main docker-compose
- Add healthchecks and timeouts for those containers
- Move node mounting script as a sidecar container so it is protected
  by healthchecks

Issue-ID: CPS-2632
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: Ib53522c2f756d3ce2c6d6b7472cb4c65359fe355