Upgrade mockito to 2.X to prevent JDK 9 WARNINGs

Running org.apache.maven.plugins.enforcer.TestDefaultEnforcementRuleHelper
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.mockito.cglib.core.ReflectUtils$2
(file:/Users/kama/.m2/repository/org/mockito/mockito-core/1.9.5/mockito-core-1.9.5.jar)
to method
java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of
org.mockito.cglib.core.ReflectUtils$2
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations
WARNING: All illegal access operations will be denied in a future release

Second:
[INFO] --- maven-invoker-plugin:2.0.0:run (integration-t...