Extend ONOS+P4 VM scripts to build tutorial VM

With Lubuntu desktop and P4-enabled code editors

Change-Id: I0c287c1d039da5f227d43994340b20a01ffc2617
diff --git a/tools/dev/p4vm/pre-ova-cleanup.sh b/tools/dev/p4vm/pre-ova-cleanup.sh
index 1f52148..e63c344 100755
--- a/tools/dev/p4vm/pre-ova-cleanup.sh
+++ b/tools/dev/p4vm/pre-ova-cleanup.sh
@@ -15,4 +15,6 @@
 rm -rf ~/p4tools/libyang/build
 rm -rf ~/p4tools/sysrepo/build
 
+sudo apt-get -y autoremove
+
 cat /dev/null > ~/.bash_history