s3:lib/messages: Don't call sec_init() too late

[github at samba.org]

New comment by abartlet on Samba Github repository

https://github.com/samba-team/samba/pull/83#issuecomment-378893538
Comment:
I'm very sorry this was left in github for so long.

This looks like it was finally fixed by another contributor by e895b6cf4a7eb3d50d618a022be74db85975bf69 in master for Samba 4.9.

The bug for backporting to 4.7/4.8 is https://bugzilla.samba.org/show_bug.cgi?id=13368