[ONOS-6665] Support for */* media type

Change-Id: I36ab16056b45213ccc641339844addc1e0c06319
diff --git a/protocols/rest/api/src/main/java/org/onosproject/protocol/http/ctl/HttpSBControllerImpl.java b/protocols/rest/api/src/main/java/org/onosproject/protocol/http/ctl/HttpSBControllerImpl.java
index 032cf0d..79c429e 100644
--- a/protocols/rest/api/src/main/java/org/onosproject/protocol/http/ctl/HttpSBControllerImpl.java
+++ b/protocols/rest/api/src/main/java/org/onosproject/protocol/http/ctl/HttpSBControllerImpl.java
@@ -273,6 +273,8 @@
             return MediaType.APPLICATION_XML_TYPE;
         case JSON:
             return MediaType.APPLICATION_JSON_TYPE;
+        case MediaType.WILDCARD:
+            return MediaType.WILDCARD_TYPE;
         default:
             throw new IllegalArgumentException("Unsupported media type " + type);