XCOMMONS-337: Replace MockitoComponentMockingRule by replacing getMockedComponent() by the more correct getComponentUnderTest()

Conflicts:

	xwiki-platform-core/xwiki-platform-ircbot/xwiki-platform-ircbot-api/src/test/java/org/xwiki/ircbot/internal/wiki/DefaultWikiIRCModelTest.java
	xwiki-platform-core/xwiki-platform-oldcore/src/test/java/com/xpn/xwiki/internal/template/DefaultPrivilegedTemplateRendererTest.java