Add an additional command to hsmdaemon to create random secret key and setup encryption

[sharidas]

Idea:

• Setup HSM based encryption
• Randomly create secret key ( you might also need to update the hsmdaemon.toml file accordingly )

Advantage: It would help the deployments easy.

Reference/Origin of this idea -> https://github.com/owncloud/encryption/pull/90#discussion_r255472939