refactor initialise_tables to use base class
refactor initialise_tables to use base class

    Includes a _get_managers function in valve for iterating over
    all managers

mwutzke/faucet,trungdtbk/faucet,anarkiwi/faucet,anarkiwi/faucet,shivarammysore/faucet,REANNZ/faucet,faucetsdn/faucet,gizmoguy/faucet,trungdtbk/faucet,mwutzke/faucet,REANNZ/faucet,gizmoguy/faucet,shivarammysore/faucet,faucetsdn/faucet