* Update to get latest release from S3
* Update mmctl to download to use S3
* Download MMCTL from S3
* Update download_mmctl_release.sh
* Update Makefile
* Update release.mk
* Update the script called, remove call to sub shell and clean up indentation
* Add quotes around THIS_BRANCH var
* Update script to support overriding the OS for packaging
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>