replace geturl with a shell out to curl - to fix broken certificate management
Merge pull request #1631 from edx/han/release-fix-geturl

replace geturl with a shell out to curl - to fix broken certificate mana...
Add the new version of apt.
validate certs=no on apt_repository due to ansible bug
Switch to using the new apt_repository module.
Merge pull request #1645 from edx/derf/ignore_cert_validations

Derf/ignore cert validations
Make devpi optional for edxapp

To enable, set the `edxapp_devpi_enabled` variable to `true` and set
edxapp_pypi_local_mirror to point to wherever devpi is installed.
Add devpi_host setting to devpi role

Allow specifying a different host than localhost.
Allow restart handler to run when updating conf

Running the edxapp role with -t edxapp_cfg requires the app to be
restarted.
Add IONISX_AUTH to edxapp’s auth config
Allow custom AWS_S3_HOST