add ability to pre configure admin user

[nabulaer]

when enabling authentication , can not login without a user, so allow config from chef the default admin user and password much like mongodb cookbook allow.

[LordBrain]

Yes, I am having this same problem. Has anyone found a work around for it? It is creating a major blocker for us.

[NickvdMeij]

+1

[amsdard]

+1

[amsdard]

Hello everyone, I've added pull request with this very feature. Please take a look, test and let me know if there is anything to improve.