The initial implementation of native LUKS support within Libvirt
introduced a small issue when using a passphrase that is a multiple of
16 bytes in size. This is documented in the following bug and associated
patch posted to the Libvirt development list:
Unable to use LUKS passphrase that is exactly 16 bytes long
https://bugzilla.redhat.com/show_bug.cgi?id=1447297
[libvirt] [PATCH] Fix padding of encrypted data
https://www.redhat.com/archives/libvir-list/2017-May/msg00030.html
This change introduces a known issue release note and logs an additional
breadcrumb when we appear to hit this with pointers to the above.
Closes-Bug: #1778044
Change-Id: Id346bce6e47431988cce7001abcf29a9faf2936a