[Merge] ~logan/ubuntu-dev-tools:ubuntu-distro-info into ubuntu-dev-tools:main

[Logan Rosen]

Logan Rosen has proposed merging ~logan/ubuntu-dev-tools:ubuntu-distro-info into ubuntu-dev-tools:main.

Requested reviews:
  Ubuntu Development Team (ubuntu-dev)

For more details, see:
https://code.launchpad.net/~logan/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/445020

As of debootstrap 1.0.128+nmu2ubuntu1.1, there are no longer scripts for each Ubuntu release, and instead it automatically uses the gutsy script if distro-info confirms that it is an Ubuntu release. This is causing the logic in pbuilder-dist to check for a debootstrap script to break and show warnings like the following:

❯ pbuilder-dist mantic update
Warning: Unknown distribution "mantic". Do you want to continue [y|N]? y 

To fix this, I've added a check to see if the distro is in the Ubuntu distro data before saying that it is unknown. I also refactored usage of UbuntuDistroData and DebianDistroData to reference a class variable, so they're only instantiated once per execution.
-- 
Your team Ubuntu Development Team is requested to review the proposed merge of ~logan/ubuntu-dev-tools:ubuntu-distro-info into ubuntu-dev-tools:main.
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