heat templates : allow access to wordpress in example templates

Latest wordpress package in Fedora defaults to deny-all so trying
to access the wordpress site on the instance no longer works,
so sed out the deny all to allow template examples and integration
tests to work again

Fixes bug 1123053

Change-Id: I7597e4f491426e639c4c19a92f610c8a693dc1f3
Signed-off-by: Steven Hardy <shardy@redhat.com>