flatten aws tags to make them easier to search

Previously tags would look like:
      {
        "class" : "com.amazonaws.services.ec2.model.Tag",
        "key" : "aws:autoscaling:groupName",
        "value" : "asgName"
      }


Now they will look like:
      {
        "aws:autoscaling:groupName" : "asgName",
        "class" : "com.amazonaws.services.ec2.model.Tag",
        "key" : "aws:autoscaling:groupName",
        "value" : "asgName"
      }

This should allow for searches like:
http://localhost:8080/edda/api/v2/view/instances;aws:autoscaling:groupName=asgName