New P4 dev and tutorial VM with Ubuntu 18.04

Change-Id: Iacf2ca8f8467dc91e696ace5ed30412f7869110a
(cherry picked from commit 2b8bcbcd3d0e3e66ee2bc681f0f1dfbb0e2a218f)
diff --git a/tools/dev/p4vm/.gitignore b/tools/dev/p4vm/.gitignore
index c67d4b1..2f47a87 100644
--- a/tools/dev/p4vm/.gitignore
+++ b/tools/dev/p4vm/.gitignore
@@ -1,2 +1,4 @@
 .vagrant
 *.ova
+*.log
+tmp/