Update tzdata to 2016i.

Note: because of what appears to be a missing MFC to stable branches,
these patches were generated by doing:

% rsync -av stable/10/contrib/tzdata releng/10.x/contrib/tzdata
% svn add releng/10.x/contrib/tzdata

Errata Notice: EN-16:19
Submitted by: gjb
Approved by: so