* pr/1099:
  Polish doc

Closes gh-1099

Issue: SPR-13294

Issue: SPR-13793

This commit also removes support code for outdated options which were only available in older schema versions.

Issue: SPR-13499

This commit also renames WebSocketIntegrationTests to WebSocketHandshakeTests.

Issue: SPR-14328

Issue: SPR-14429

This commit adds a test runtime dependency on log4j 2 for every project
and migrates all log4j.properties files to log4j2-test.xml files.

Issue: SPR-14431

Issue: SPR-13575

Issue: SPR-13188

Issue: SPR-13810

Issue: SPR-14429

Issue: SPR-14430

This commit also removes outdated support classes for Oracle, GlassFish, JBoss.

Issue: SPR-14429

Issue: SPR-13495

Issue: SPR-14055

Commit 09008088 resolved the previous issue by moving the warning
suppression from the method parameter to the method itself.

Issue: SPR-13188

This commit also fixes broken javadoc links and code references.

Issue: SPR-13188

Issue: SPR-13481
Issue: SPR-13827

Issue: SPR-14426

Issue: SPR-14130

This commit also removes the corresponding deprecated Servlet MVC variant and updates DispatcherServlet.properties to point to RequestMappingHandlerMapping/Adapter by default.

Issue: SPR-14129

Issue: SPR-13189

Issue: SPR-13795

Issue: SPR-13229

Issue: SPR-13796

Issue: SPR-13495

Issue: SPR-14344

Issue: SPR-13794

Issue: SPR-14422

This commit introduces initial support for JUnit Jupiter (i.e., the new
programming and extension models in JUnit 5) in the Spring TestContext
Framework.

Specifically, this commit introduces the following.

- SpringExtension: an implementation of multiple extension APIs from
  JUnit Jupiter that provides full support for the existing feature set
  of the Spring TestContext Framework. This support is enabled via
  @ExtendWith(SpringExtension.class).

- @SpringJUnitConfig: a composed annotation that combines
  @ExtendWith(SpringExtension.class) from JUnit Jupiter with
  @ContextConfiguration from the Spring TestContext Framework.

- @SpringJUnitWebConfig: a composed annotation that combines
  @ExtendWith(SpringExtension.class) from JUnit Jupiter with
  @ContextConfiguration and @WebAppConfiguration from the Spring
  TestContext Framework.

Issue: SPR-13575

Issue: SPR-13188

Issue: SPR-14362