This change drops the encryptor classes and supporting code from the
codebase in favor of the classes provided by os-brick. This is made
possible by the following os-brick change that introduced new encryption
provider constants during Ocata :
Ic155bd29d46059832cce970bf60375e7e472eca6
Thanks to the following bugfix also released as part of 1.11.0 for Ocata
the constants present in os-brick also support the use of the deprecated
legacy class paths from Nova, for example
nova.volume.encryptors.luks.LuksEncryptor, while using the os-brick
provided classes :
I3ec6e3fe919bc03d158da04a18fb8b651002ed52
Implements: blueprint switch-to-os-brick-encryptor-classes
Change-Id: I37ffc90c0bd57029fced251b5cfd7cd4318a0292
Depends-On: Iae12605dc7d0607e78020a24b5b8801606c2f169