block: rip out all traces of password prompting

block: rip out all traces of password prompting

Now that qcow & qcow2 are wired up to get encryption keys
via the QCryptoSecret object, nothing is relying on the
interactive prompting for passwords. All the code related
to password prompting can thus be ripped out.

Reviewed-by: Alberto Garcia <[email protected]>
Reviewed-by: Max Reitz <[email protected]>
Signed-off-by: Daniel P. Berrange <[email protected]>
Message-id: 20170623162419[email protected]
Signed-off-by: Max Reitz <[email protected]>