Enable Salt 2014.7's State Aggregation

* Move everything to using ``pkgrepo``
* Move all repos to be ``order: 2``
  * Essentially salt will run any state with a declared integer order, then any state without a declared order, then any state with a declared order of ``last``. By moving these here we make sure that all repos have been added before any other states are called.
* Turn on aggregation
  * The first time a aggregation enabled state is found (currently only ``pkg.installed``) it will collect up all of the instances of that state and aggregate them into a single instance. This means that all of the installations of packages occurs at once.
* Remove no longer used duosec states
* Fix the wal-e PostgreSQL states.