Upgraded used checkstyle version to 8.0
Upgraded used checkstyle version to 8.0

apache/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd,lgoldstein/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd,apache/mina-sshd,lgoldstein/mina-sshd