spice port selected from range so more than one vm can be run

quickemu

@@ -104,6 +104,19 @@ function get_port() {
     done
 }
 
+function get_spice_port() {
+    local PORT_START=5930
+    local PORT_RANGE=9
+    while true; do
+        local CANDIDATE=$[${PORT_START} + (${RANDOM} % ${PORT_RANGE})]
+        (echo "" >/dev/tcp/127.0.0.1/${CANDIDATE}) >/dev/null 2>&1
+        if [ $? -ne 0 ]; then
+            echo "${CANDIDATE}"
+            break
+        fi
+    done
+}
+
 enable_usb_passthrough() {
   local DEVICE=""
   local USB_BUS=""