QA/TestCases/LUKS Select encryption (fs on partition of RAID device (md0))

Description
Support the use of encrypted filesystems for anything other than /boot using cryptsetup and LUKS. This includes install time creation/configuration, as well as integrated support in mkinitrd and initscripts (others?). Currently we are only pursuing support for encrypted devices using cryptsetup/LUKS.

When using encrypted file systems/block devices, the functionality should continue to work as expected, and not create situations where the encryption leads to undesired errors.

References:
 * 1) Anaconda/Features/EncryptedBlockDevices
 * 2) Releases/FeatureEncryptedFilesystems

Steps To Reproduce
create new RAID device member partitions
 * start the installer
 * enter the disk druid paritioning screen
 * verify existing RAID device member partitions (such as sda1), OR
 * Create a new RAID filesystem (such as device md0)
 * select the "encrypt" checkbox for the partition using the new device
 * enter a passphrase for the partition
 * continue the installation

Expected Results
in post-install system, verify:
 * a passphrase for the RAID device (such as device md0) is required to access it
 * an entry for the filesystem using the RAID device (md0) exists in /etc/crypttab