Deprecate RHEL 6 / CentOS 6#439

Merged

blag merged 6 commits intoStackStorm:masterfrom

amanda11:remove_el6

Jul 31, 2020

Commits on Jul 10, 2020

Commits on Jul 13, 2020

Address review comments to install bats via yum, therefore also do not need the check on bats-core directory
amanda11
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Commits on Jul 16, 2020

Commits on Jul 31, 2020

Install bats from npm
amanda11
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