QA:TestCases/rescue mode ext4

= Description = | Mount and recover ext4 partitions from rescue mode

= How to test = |
 * 1) Boot the installer
 * 2) Advance to the (ddruid) partitioning screen
 * 3) Create a new (or use existing) ext4 partition and assign a non-/boot mount point
 * 4) complete installation
 * 5) reboot into post-install system using rescue mode

= Expected Results = |
 * 1) installation completes successfully
 * 2) installation enters rescue mode
 * 3) rescue mode detects and mounts ext4 partition successfully
 * 4) user can interact with ext4 filesystem (read, write & edit files)