Find wireshark dir using find (fix for 13.10)

util/install.sh

@@ -255,7 +255,7 @@ function wireshark {
         export WIRESHARK=/usr/include/wireshark
         scons
         # libwireshark0/ on 11.04; libwireshark1/ on later
-        WSDIR=`ls -d /usr/lib/wireshark/libwireshark* | head -1`
+        WSDIR=`find /usr/lib -type d -name 'libwireshark*' | head -1`
         WSPLUGDIR=$WSDIR/plugins/
         sudo cp openflow.so $WSPLUGDIR
         echo "Copied openflow plugin to $WSPLUGDIR"