Updated script to build P4 VM

Among other things, build now is not based on the upstream version of
onos-setup-p4-dev, but on the local one.

Change-Id: I270a324152a9349d6a9989aa8b5a38b45e1856d9
diff --git a/tools/dev/p4vm/pre-ova-cleanup.sh b/tools/dev/p4vm/pre-ova-cleanup.sh
index 17b15f3..3ea45e1 100755
--- a/tools/dev/p4vm/pre-ova-cleanup.sh
+++ b/tools/dev/p4vm/pre-ova-cleanup.sh
@@ -12,5 +12,9 @@
 cd ~/p4tools/bmv2/targets && make clean
 cd ~/p4tools/p4runtime && make clean
 rm -rf ~/p4tools/p4c/build
+rm -rf ~/p4tools/libyang/build
+rm -rf ~/p4tools/sysrepo/build
 
 cat /dev/null > ~/.bash_history
+
+poweroff