A couple of lines to autogenerate the date based on the day that
the archetype is run. The date is then formatted appropriately
and used as the yang revision. This helps keep the yang data
model writer honest.
Change-Id: Ic885b71a777119702b3ce78a21623298c44ad9c1 Signed-off-by: Ryan Goulding <ryandgoulding@gmail.com>