Remove duplicate polling set
Warn user that change will not take effect immediately
Fix #1047

* When advanced options (LRO, TSO and CSUM) changes, enable capabilities
  again on interfaces
* For lagg and bridge, check caps instead of encaps and enable flags
  when it's necessary for all members
* Take in consideration Disable (LRO, TSO, CSUM) options from
  system->advanced when configuring lagg and bridge