promote 16.04.7.1 to stable

promote 16.04.6.6 to stable

promote 16.04.6.5 to stable

promote 16.04.6.4 to stable

update sigs and testing instructions for 16.04.6.4

promote 16.04.6.3 to stable

update sigs and testing instructions for 16.04.6.2

Merge branch 'master' of https://github.com/Security-Onion-Solutions/…

…security-onion

Merge branch 'master' of https://github.com/Security-Onion-Solutions/…

…security-onion

update sigs and testing instructions for 16.04.5.6