Fixes #7949: show affected packages of errata on details page.

http://projects.theforeman.org/issues/7949
Without them:
![screen shot 2014-10-17 at 11 02 48 am](https://cloud.githubusercontent.com/assets/4116405/4680915/bb477524-560e-11e4-8f1e-e35004122159.png)

I had to remove the margin so there isn't 4px on the left and I displayed as pre so the newlines were preserved.  I didn't want these changes applying to all `.info-value`s so hence the specificity.