This class is responsible for waking up paused workflows. Its run-method is called from OpenXPKI::Server::Watchdog and
recieves the db resultset as only argument. Immediately a child process will be created via fork() and _wake_up_workflow is called within the child.
_wake_up_workflow reads all necessary infos from the resultset (representing one row from workflow table)
the serialized session infos are imported in the current (watchdogs) session, so that the wqorkflow is executed within its original environment.
the last performed action is retrieved from workflow history, than executed again (via OpenXPKI::Server::API::Workflow)