Don't send up all_checked checkbox IDs upto server on onselect event.

- Made changes to JS method to not send up all_checked checkboxes on onselect event, this was causing JS error when there were lots of nodes in the tree, as a result of that transaction was not being sent upto server. Made changes to set/save C&U collection based upon checkbox that was changed and sent up. Removed code that was expecting all_checked checkboxes to come in with JS transaction.
- Changed code to only call Metric::Targets.perf_capture_always if any of the "Collect for All XXX" checkboxes values were changed and only for the one that's value was changed.

https://bugzilla.redhat.com/show_bug.cgi?id=1153047
https://bugzilla.redhat.com/show_bug.cgi?id=1145799

@dclarizio please review/test. Let me know If you need db with lots of nodes to recreate the issue.
@Fryguy I assumed that since we have to pass the hosts in to the `set_perf_collection_object_list` method on the cluster object, it would mean that if we moved the find outside the loop, we would have to separate all those hosts to be on a "per cluster" basis again.  I'm not sure how hosts relate to clusters, so that could be painful.