Upgraded Mockito version to 2.21.0
Upgraded Mockito version to 2.21.0

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