Follow-up on NETOBSERV-73 (AND / OR filters)

As suggested in comment here: https://issues.redhat.com/browse/NETOBSERV-73?focusedCommentId=19165544&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-19165544

Create advanced filters that stand for a combination of single filters:

• Pods => SrcPod OR DstPod
• Port => SrcPort OR DstPort
• etc.

UXD to be involved as the number of available filters is growing a lot, making it less easy to navigate & select filter (suggestion e.g: we could maybe list only the "most common filters", followed by a link/button "Show all filters" that expands the list)