QA:Anaconda storage probe test case

Description

A simple test to check that Anaconda is able to detect the presence of disk devices.

How to test

1. Start anaconda's stage2 (see QA:Anaconda_stage2_fetch_test_case)
2. Proceed through the dialogs until you reach the partitioning screen:
   1. Choose your language and keyboard model
   2. Proceed through the "pre-release software" warning screen (if necessary)
   3. Wait for a dialog that says Examining storage devices...
   4. Proceed through the hostname screen
   5. Proceed through the Timezone selection screen
   6. Choose a root password and type it twice to proceed
3. On the partitioning screen, choose Create custom layout and click Next

Expected Results

1. All the hard disk devices / partitions on the system should be listed on the custom partitioning screen