sudo security, bug fix, and enhancement update

1.8.6p7-20 - RHEL 7.3 erratum - fixed visudo's -q flag Resolves: rhbz1350828 1.8.6p7-19 - RHEL 7.3 erratum - removed INPUTRC from envkeep to prevent a potential info leak Resolves: rhbz1340700 1.8.6p7-18 - RHEL 7.3 erratum - removed requiretty flag from the default sudoers policy - backported...