Removed the setServiceDirectory() method from the base web resource

This is a testing only API and potentially dangerous to allow to be public.
I modified the tests that use it to set the value using TestUtils.setField()

Change-Id: Ic590f4641f4e3de208dffa16b3df9a9a2106114b
diff --git a/web/api/src/test/java/org/onosproject/rest/resources/DevicesResourceTest.java b/web/api/src/test/java/org/onosproject/rest/resources/DevicesResourceTest.java
index 169cb11..75d33a8 100644
--- a/web/api/src/test/java/org/onosproject/rest/resources/DevicesResourceTest.java
+++ b/web/api/src/test/java/org/onosproject/rest/resources/DevicesResourceTest.java
@@ -27,7 +27,6 @@
 import org.junit.Test;
 import org.onlab.osgi.ServiceDirectory;
 import org.onlab.osgi.TestServiceDirectory;
-import org.onlab.rest.BaseResource;
 import org.onosproject.codec.CodecService;
 import org.onosproject.codec.impl.CodecManager;
 import org.onosproject.net.DefaultPort;
@@ -36,16 +35,15 @@
 import org.onosproject.net.MastershipRole;
 import org.onosproject.net.Port;
 import org.onosproject.net.device.DeviceService;
-import org.onosproject.net.driver.DriverService;
 import org.onosproject.net.driver.DefaultDriver;
-import org.onosproject.net.driver.TestBehaviourImpl;
+import org.onosproject.net.driver.DriverService;
 import org.onosproject.net.driver.TestBehaviour;
+import org.onosproject.net.driver.TestBehaviourImpl;
 import org.onosproject.net.driver.TestBehaviourTwo;
 import org.onosproject.net.driver.TestBehaviourTwoImpl;
 
 import javax.ws.rs.NotFoundException;
 import javax.ws.rs.client.WebTarget;
-
 import java.util.ArrayList;
 import java.util.List;
 
@@ -247,7 +245,7 @@
                         .add(DriverService.class, mockDriverService)
                         .add(CodecService.class, codecService);
 
-        BaseResource.setServiceDirectory(testDirectory);
+        setServiceDirectory(testDirectory);
     }
 
     /**