Users don't know to update after doing enabling autobuilds

[MarcRandolph]

https://blueprints.launchpad.net/mythbuntu/+spec/easy-mythtv-setup describes setup process so easy that a caveman could do it.
Autobuilds is designed to help get major bug fixes to mythtv to those same users (this is needed since mythtv is undergoing rapid development and continuous bug fixes, use).

Unfortunately, when someone enables/installs the autobuilds script doesn't do two things for the user:

1. sudo apt-get update
2. sudo apt-get upgrade

We should either do it for the user, or tell them that they need to do it.

After a small amount of discussion, it was decided that doing it for the user is not ideal. We could push them to MCC and tell them to configure/update things there, but since update-manager and synaptic are already there and polished, developers shouldn't spend their valuable time re-inventing a pure "update" fucntion in yet another place (MCC or elsewhere).

The better solution is to simply pop up a debconf question up telling them:

<<
To complete the transition to auto-builds, please open update-manager (or synaptic) and click Check (or Reload) and then install updates as you normally would.
>>