Improve MOTD; don't need to manually run-parts if PAM is fixed

/run is a ramdisk, anyway.

provision-files/etc/update-motd.d/99-railsbridge

@@ -11,5 +11,7 @@ will appear here in /vagrant. This lets you edit files with your
 Windows or mac OS text editor, and run them here in the VM.
 
 To leave the virtual machine, type this and press return:
+
     exit
+
 EOF

provision-root-cleanup.sh

@@ -10,6 +10,9 @@ rm -rf /tmp/provision-files
 rm -rf /usr/local/src/ruby-*
 rm -rf /usr/local/src/chruby-*
 
+# Work around MOTD cruft from https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1563854
+rm -f /var/lib/update-notifier/updates-available
+
 # Clean up APT cache and zero out disk to reduce image size
 apt-get clean
 dd if=/dev/zero of=/EMPTY bs=1M

provision-root-install.sh

@@ -18,9 +18,9 @@ apt-get install -q -y make nodejs sqlite3 libsqlite3-dev
 # Copy our files into place
 rsync -rtv /tmp/provision-files/etc/ /etc/
 rsync -rtv /tmp/provision-files/usr/local/bin/ /usr/local/bin/
-# Force MOTD generation
-rm -f /etc/update-motd.d/51-cloudguest
-run-parts --lsbsysinit /etc/update-motd.d > /run/motd.dynamic
+
+# Clean up MOTD; don't need these Ubuntu links
+rm -f /etc/update-motd.d/10-help-text /etc/update-motd.d/51-cloudguest
 
 # Do all source installation from this dir, which we'll clean up in another script
 mkdir -p /usr/local/src && cd /usr/local/src