SiteServiceImplTest: reduce test cases duplication by adding tests for logEvent().

Fix #346

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/service/SiteServiceImpl.java

@@ -124,8 +124,9 @@ public void logAboutInvalidCsrfToken(HttpServletRequest request) {
 
 	}
 
+	// protected for using in unit tests
 	@SuppressWarnings({"PMD.UseObjectForClearerAPI", "checkstyle:parameternumber"})
-	private void logEvent(
+	protected void logEvent(
 			String type,
 			String page,
 			String method,