The default is now SecurityProperties.ACCESS_OVERRIDE_ORDER-1
(instead of 3), and the user can set it with
security.oauth2.resource.filter-order (as opposed to being hard
coded). The filter is provided by Spring OAuth2 so this change is
a BeanPostProcessor to call a setter on that object.
Fixes gh-5072
This commit enables compatibility build against Spring Framework 5.
The Velocity and Guava support that are deprecated in the 1.x line have
been removed and few other classes contain minor change to comply to non
backward compatible changes in Spring Framework 5.
This commit also switches the required java version to 8.
Closes gh-6977
