L2SS-555: Merge common initialisation code and add required properties to abstract base class already.

L2SS-555: Split off common archiver/retriever functions, have retreiver use same get_db_config function

L2SS-561: Add 100mb log limit to all containers not using syslog

Closes L2SS-561

See merge request !224

Fixes syntax error. Don't spurious warn if removing an attribute that isn't archived. Make is_attribute_archived more exact.

Allow attributes to be read/written also if device is alarming. We want to be able to know its status then, after all.

L2SS-588: Prevent running integration tests twice

Closes L2SS-588

See merge request !230

Resolve L2SS-578 "Precise hbat delay steps"

Closes L2SS-578

See merge request !228

L2SS-523 "Add signal delay calibration table to BEAM"

Closes L2SS-523

See merge request !227