Fix naming convention issues in preparation for stricter checkstyle enforcement

Change-Id: I918b7b1dcf6424a526b6b26b89acc9a57d807fec
diff --git a/apps/test/demo/src/main/java/org/onosproject/demo/DemoInstaller.java b/apps/test/demo/src/main/java/org/onosproject/demo/DemoInstaller.java
index a408e69..0bddc08 100644
--- a/apps/test/demo/src/main/java/org/onosproject/demo/DemoInstaller.java
+++ b/apps/test/demo/src/main/java/org/onosproject/demo/DemoInstaller.java
@@ -87,7 +87,7 @@
  */
 @Component(immediate = true)
 @Service
-public class DemoInstaller implements DemoAPI {
+public class DemoInstaller implements DemoApi {
 
     private final Logger log = getLogger(getClass());