Set Sleep Times as Environment Variable in CSIT

Sleep times for Model and Data sync were being set to 2 seconds in the docker-compose file so that it may be used in CSIT tests
This change defaults them to 30 seconds and adds environment variables which are overridden by the test.properties for CSIT tests

Issue-ID: CPS-1195
Signed-off-by: lukegleeson <luke.gleeson@est.tech>
Change-Id: Id254e3ec82fb4685fd6678d1a345b16f108b2707