db-datanommer02: supress warnings from pg_dump
    
    db-datanommer02 uses timescaledb. When you do a pg_dump there's warnings
    due to this, but according to upstream they are all completely harmless.
    So, to avoid an email to everyone every day, lets just try and supress
    these, but yet hopefully not supress real errors if they every occur.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>