Check installed sbt version, install in /usr/local, retry on downloads#4

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mbautin wants to merge 5 commits intoAnsibleShipyard:masterfrom mbautin:check_installed_version

+74-14

Commits on Mar 22, 2019

Update sbt version and download link
mbautin
committed

Commits on Sep 20, 2019

Install sbt in /usr/local
mbautin
committed

Commits on Dec 4, 2019

Don't re-download sbt if the correct version is already installed. Validate installed version.
mbautin
committed

Commits on Jan 10, 2020

Add retries to the sbt version validation task which frequently fails
mbautin
committed

Commits on Nov 13, 2020

Switch download URL to GitHub; verify downloaded archive's checksum.
mbautin
committed