Bug 959023

Description of problem:

Make search_utility.py be able to do this in a nicer manner
https://bugzilla.redhat.com/show_bug.cgi?id=912607

Version-Release number of selected component (if applicable):


How reproducible:

Always

Steps to Reproduce:
1. Try to implement the above BZ
2.
3.
  
Actual results:

Kinda hacky

Expected results:

Less so

Additional info:

My initial thought was to define customisable column filters on the columns themselves. Currently customisable filters are per column (and defined in the
'table' class), and are not able to be grouped together by 'types' within that table. We already do have customisable column objects though, so we could just expand them to do something like this:

  class InventoryFilter(Filter):

      def is_not(self, col, val):
          # Return relevant WhereClause
          # that excludes non NULLs and maybe
          # does additional filter on lastcheckin
  

  class InventoryColumn(MyColumn):

      filter = InventoryFilter
      

  ~
  custom_filter = getattr(column.filter, '%s' % operation)
  # etc 

This would mean they columns are responsible themselves for defining customisable filters.