vm.zsh: Various Updates

* Improve the exit trap to make sure child processes are stopped
* wait $(jobs -pr) is the same thing as wait with no options

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

vm.zsh

@@ -33,12 +33,8 @@ function vm_reboot() {
 	vm_boot $1
 }
 
-TRAPEXIT() {
-	if [[ ! -z "$(jobs -pr)" ]]; then
-		for job in ($(jobs -pr)); do
-			kill -9 $job
-		done
-	fi
+TRAPINT() {
+	kill -9 0
 }
 
 for vm in "${@:2}"; do
@@ -59,4 +55,4 @@ for vm in "${@:2}"; do
 	esac
 done
 
-wait $(jobs -pr)
+wait