[Merge] ~jchittum/livecd-rootfs:vagrant_slow_boot_workaround_with_null_file into livecd-rootfs:ubuntu/master

[Robert C Jennings]

My overall thought is that there are a lot of words here for the end-user to parse about the history of things.  I would suggest we get to the point quicker and then provide background.  What do you think about something like this?

# Create a NULL serial port to skip console logging by default
vb.customize [ "modifyvm", :id, "--uartmode1", "file", File::NULL ]
# If console logging is desired, uncomment this line and remove the prior line
# vb.customize [ "modifyvm", :id, "--uartmode1", "file", File.join(Dir.pwd, "${prefix}-console.log") ]
# NOTE: Ubuntu cloud images, by default, enable tty=ss0. This enables serial consoles to
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https://code.launchpad.net/~jchittum/livecd-rootfs/+git/livecd-rootfs/+merge/389918
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~jchittum/livecd-rootfs:vagrant_slow_boot_workaround_with_null_file into livecd-rootfs:ubuntu/master.