Fix compilation error: Remove deprecated WebAppAdminClient field

Author: DakshithaS

product-scenarios/scenarios-common/src/test/java/org/wso2/am/scenario/tests/common/DeploymentInitializerTestCase.java

@@ -40,7 +40,6 @@
 public class DeploymentInitializerTestCase extends ScenarioTestBase {
     private static final Log log = LogFactory.getLog(DeploymentInitializerTestCase.class);
 
-    private WebAppAdminClient webAppAdminClient;
     private String resourceLocation = System.getProperty("test.resource.location");
 
     @Test