Fix Sonar issue:

Strings literals should be placed on the left side when checking for
equality

Change-Id: I4537e08936731ace55aeecb3ad941269ec1eb191
diff --git a/web/api/src/test/java/org/onosproject/rest/resources/NetworkConfigWebResourceTest.java b/web/api/src/test/java/org/onosproject/rest/resources/NetworkConfigWebResourceTest.java
index 21b7ca4..c14ba8c 100644
--- a/web/api/src/test/java/org/onosproject/rest/resources/NetworkConfigWebResourceTest.java
+++ b/web/api/src/test/java/org/onosproject/rest/resources/NetworkConfigWebResourceTest.java
@@ -142,9 +142,9 @@
 
         @Override
         public SubjectFactory getSubjectFactory(String subjectClassKey) {
-            if (subjectClassKey.equals("devices")) {
+            if ("devices".equals(subjectClassKey)) {
                 return mockDevicesSubjectFactory;
-            } else if (subjectClassKey.equals("links")) {
+            } else if ("links".equals(subjectClassKey)) {
                 return mockLinksSubjectFactory;
             }
             return null;