Bug fix for scan sources reported as destinations

In the /var/log/psad/<ip>/ directories, whois information is stored in the
<IP>_whois files, the IP in the filename was included as a destination IP under
the psad -S output.  This commit fixes this bug.  Here is an example of the
invalid output:

[+] IP Status Detail:

SRC:  123.123.123.221, DL: 2, Dsts: 2, Pkts: 1, Unique sigs: 1, Email alerts: 1

    DST: 1.2.3.4, Local IP
        Scanned ports: TCP 1433, Pkts: 1, Chain: INPUT, Intf: eth0
        Signature match: "MISC Microsoft SQL Server communication attempt"
            TCP, Chain: INPUT, Count: 1, DP: 1433, SYN, Sid: 100205
    DST: 123.123.123.221

psad

@@ -8535,6 +8535,7 @@ sub import_ip_dirs() {
         ### get all of the destination ip addresses
         my %dst_ips;
         for my $scan_file (@scan_files) {
+            next if $scan_file =~ /_whois/;  ### may be <src>_whois
             if ($scan_file =~ /($ip_re)/) {
                 $dst_ips{$1} = '';
             }