Generate tutorial p4vm with a specific ONOS version

Also:
- Updated Bazel version
- Removed non-working code to auto-login user and disable screen saver
- Reduce size by doing a shallow clone of ONOS

Change-Id: Ie6efc3ebd6766164e7051f28dff89046141afa7f
diff --git a/tools/dev/p4vm/tutorial-bootstrap.sh b/tools/dev/p4vm/tutorial-bootstrap.sh
index 8f4b5b8..6cff71b 100755
--- a/tools/dev/p4vm/tutorial-bootstrap.sh
+++ b/tools/dev/p4vm/tutorial-bootstrap.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Installs Lubuntu desktop and code editors.
+# Installs desktop utilities and code editors.
 # Largely inspired by the P4.org tutorial VM scripts:
 # https://github.com/p4lang/tutorials/
 
@@ -54,26 +54,7 @@
     sublime-text-installer \
     vim
 
-# Disable screensaver
-gsettings set org.gnome.desktop.screensaver lock-delay 3600
-gsettings set org.gnome.desktop.screensaver lock-enabled false
-gsettings set org.gnome.desktop.screensaver idle-activation-enabled false
-
-# Automatically log into the SDN user
-cat << EOF | sudo tee /etc/lightdm/lightdm.conf
-[SeatDefaults]
-autologin-user=sdn
-EOF
-
-# Vim
-cd /home/sdn
-mkdir -p .vim
-mkdir -p .vim/ftdetect
-mkdir -p .vim/syntax
-echo "au BufRead,BufNewFile *.p4      set filetype=p4" >> .vim/ftdetect/p4.vim
-echo "set bg=dark" >> .vimrc
-wget https://github.com/p4lang/tutorials/blob/master/vm/p4.vim
-mv p4.vim .vim/syntax/p4.vim
+# TODO: Disable screensaver and automatically log into the SDN user
 
 # Sublime
 cd /home/sdn