Upgraded Mockito version to 2.23.0
Upgraded Mockito version to 2.23.0

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