The base requirements now use an updated verison of ansible (1.9), so we
do not need to have this install step.

Selectively copy playbook dirs to avoid broken links
Install git in packer script so that the edx ansible fork can be installed via requirements.txt

TE-583

TE-583

The test_build_server role was failing on acceptance tests because of unicode
static assets being gathered in collectstatic for django. This was because of
this issue https://github.com/ansible/ansible/issues/6655, which has been
resolved in recent ansible versions. We must override the version that is
being used by this repo, and upgrade ansible at provisioning time for
running the test_build_server role.

Also disables lettuce verification on test_build_server role.