bug with newer Net::ARP version numbers

This bug was first reported on redhat bugzilla (and patched) some time ago.
https://bugzilla.redhat.com/show_bug.cgi?id=1169914

in lib/Agent/Helpers/Network.pm this if statement makes a numerical comparison on the version number of the Net::ARP perl module. For any version that is less than 1.0 (ie 0.x) needs to call a different function to get the mac address.

                if ($Net::ARP::VERSION < 1.0) {
                        Net::ARP::get_mac($if, $mac);
                }
                else {
                        $mac = Net::ARP::get_mac($if);
                }

The check "$Net::ARP::VERSION < 1.0" outputs a warning for a version such as "1.0.8", and since warnings are fatal, the code dies before running the send_arp() steps.

The patch changes the check to
                if ($Net::ARP::VERSION =~ /^0/) {
That is, check if the version starts with a zero.

This affects all versions including 2.2.1