[PATCH] lsa4_srv: Factor out dcesrc_lsa_valid_AccountRight()

[vl at samba.org]

On Fri, Apr 28, 2017 at 07:11:55AM +1200, Andrew Bartlett via samba-technical wrote:
> Any chance of a test, so we don't regress on this again?
> 
> Either blackbox on the indicated command, python (I find this the
> easiest way to do these nowadays) or in the lsa tests in smbtorture?

Sorry, did not have time for a test yet. I'll leave it as a private
patch for the time being.

Thanks for the review.

Volker