This class implements an interface for the AWS Cloud HSM using the dynamic
engine driver and the fake key files. The credentials for the HSM must be set
via the environment from outside OpenXPKI as documented by AWS.
This class sets "-engine cloudhsm" and forces the
internal password to be undef, it does not support any additional engine
Set engine: AWSCloudHSM and set the key attribute to point to the
fake-key file (supports local file or datapool as with plain OpenSSL software
returns the used OpenSSL engine 'cloudhsm'.