Task #8898: Stop whole process group for services started through bash, and use .log as extension for stdout of services

Task #8991 Change for the generic pipeline -> executable_casa.py: Merge with the multi-epoch version.

Task #8899: Moved python coverage check to separate bash function, and added lib to store database credentials for python services.

Task #8746 Adding a error_tolerance option to the executable_args master script. This controls if the step exits at the first error or if a pipeline should continue with the successfull processed steps. Usage in the parset on a step by step basis: stepname.control.error_tolerance=<Bool>

Task #8899: Allow broker options to be specified in FromBus/ToBus constructor (final final fix for tests without auto-reconnect, hopefully)

Task #8899: Credentials now have their own class, and a specific function to convert to str and to pg.connect options

Task #8899: Propagate username, password, port to pg.connect. Also, return dbcreds["port"] as an int