Handle aspen.1 openedx release
Use curl instead of get_url

* Handles cert validation from behind a proxy better
* Also this commit updates build server validation (i.e. testcase
    paths) that have changed on platform
Merge pull request #1668 from edx/benp/fix-packer-cert-error

Use curl instead of get_url for packer zip download
Merge pull request #1669 from edx/handle-aspen.1-tag

Handle aspen.1 openedx release
Add HAProxy check user to prevent `max_connect_error` exceptions
Merge pull request #1673 from mitodl/cg/add_haproxy_mariadb_user

Add HAProxy check user to prevent `max_connect_error` exceptions
Merge pull request #16 from edx/master

Try to merge  Master@2014.10.31