removed singleton pattern from service loaders

Former-commit-id: 0e7b90141333548c47fbb4c9944b44fe295acfec

dependency-check-core/src/test/java/org/owasp/dependencycheck/analyzer/AnalyzerServiceTest.java

@@ -33,7 +33,7 @@ public class AnalyzerServiceTest extends BaseTest {
      */
     @Test
     public void testGetAnalyzers() {
-        AnalyzerService instance = AnalyzerService.getInstance();
+        AnalyzerService instance = new AnalyzerService();
         Iterator<Analyzer> result = instance.getAnalyzers();
 
         boolean found = false;