Going from `release-7.9` to `release-7.10,` has introduced a bug, in the download_mmctl_release.sh script, in which it is unable to o match version numbers with multiple digits
Specifically, `release-7.10` returned `release-7.1` downloading wrong mmctl binary.
We are refactoring the regular expression used, to match version numbers with multiple digits.
Ticket: https://mattermost.atlassian.net/browse/CLD-5682
ce165302cf