userportal,webadmin: grid refresh improvements

- Minor code cleanup.
- Fixed issue where refresh change was not registered by
  the one of the active models when clicking out and into
  the window. This behavior was shown when you had the refresh
  rate at 5 seconds, then clicked out of the window making
  everything switch to 60, one of the active models would stay
  at 5 seconds.
- Minor speed improvement on how many events where sent when the
  refresh rate was changed.

Change-Id: I6d0a2af533285b4248305db3a5e5851d0d004fa0
Signed-off-by: Alexander Wels <awels@redhat.com>