config tool:Fix tap name filter error

when tap name is number, it will lead to failure of
adding tap dev, fix it.

Tracked-On: #7351

Signed-off-by: hangliu1 <hang1.liu@linux.intel.com>

misc/config_tools/launch_config/launch_script_template.sh

@@ -52,7 +52,7 @@ function unbind_device() {
 function create_tap() {
     # create a unique tap device for each VM
     tap=$1
-    tap_exist=$(ip a | grep "$tap" | awk '{print $1}')
+    tap_exist=$(ip a | grep "$tap: " | awk '{print $1}')
     if [ "$tap_exist"x != "x" ]; then
         echo "$tap TAP device already available, reusing it."
     else