Match server version of DM API proto.
Some fields are renamed:
* new_public_key_verification_signature
--> new_public_key_verification_signature_deprecated
* PolicyPublicKeyAndDomain
--> DEPRECATEDPolicyPublicKeyAndDomain
* RemoteCommand.unique_id
--> RemoteCommand.command_id
BUG=
645078
Committed:
https://crrev.com/78ff9da2c0349d700b15428c6da567c61b894f1a
Cr-Commit-Position: refs/heads/master@{#429257}