Add tokenInit to import otpkey

[scpcom]

A web application (in my case guacamole) who uses the privacyIDEA java-client may have already a otpkey associated with the user in its DB.
This commit would add a function to import it to privacyIDEA via token init.

[nilsbehlen]

thanks for your contribution.
i think we should rename the existing token init function from tokenRollout to tokenInit so that the one you added is an overloaded one.

[scpcom]

Personally I prefer to keep backward compatibility.
On the other hand I started using the java-client only few weeks ago, so it would be also OK if tokenRollout gets renamed.

[nilsbehlen]

We will keep the old function and mark it as deprecated.

[scpcom]

OK, do I need to do additional steps/update code in my branch?

[nilsbehlen]

No, i just writing this a memo to myself when i get to this i will make the changes when merging, you are fine.