Updated: [rhinstaller/anaconda/pulls/182 master] Driverdisk refactor

[dashea]

Okay, here it is - the big refactor of driver-updates. `README.dd` still needs to be updated, but the code is all here. It also adds a suite of unit tests for `driver-updates` and a kickstart test for the `driverdisk` command.

Other than some minor text changes the overall behavior should be the same, except for one thing: we no longer attempt to unload running modules. (This is, I think, outside the scope of what problems the driver-updates stuff is designed to solve. `modprobe.blacklist` can handle the rare cases where a driver-updates disk needs to replace an existing module.)

Resolves: RHBZ#1084197
Resolves: RHBZ#1164131