Diag DNS Lookup Dialog Output

Display DNS lookup results in a dialog box rather than browsing away from the current page (Dashboard Firewall Widget or Status: System logs: Firewall) to the diag DNS page.
Especially useful when filtering so that filter does not have to be reposted to return to the current page.
Merge pull request #485 from N0YB/Diag_DNS_Lookup_Dialog_Output

Diag DNS Lookup Dialog Output