Fixes related to disabling state functionality

Found an issue in the sls function when disabling states.  Originally Ihad used the show_lowstate to get what would be applied to the minion, to check for disabled states.  Turns out this shows what would be applied during a high state and not from an SLS file.  Switching to using st_.state.compile_high_data inside the SLS and moving the show_lowstate call into the highstate function where it's correct.