allow interceptors to be registered via properties

src/main/resources/application.yaml

@@ -131,6 +131,14 @@ hapi:
     search-coord-core-pool-size: 20
     search-coord-max-pool-size: 100
     search-coord-queue-capacity: 200
+    
+    # comma-separated package names, will be @ComponentScan'ed by Spring to allow for creating custom Spring beans
+    #custom-bean-packages:
+    
+    # comma-separated list of fully qualified interceptor classes. 
+    # classes listed here will be fetched from the Spring context when combined with 'custom-bean-packages', 
+    # or will be instantiated via reflection using an no-arg contructor; then registered with the server  
+    #custom-interceptor-classes:  
 
     # Threadpool size for BATCH'ed GETs in a bundle.
     #    bundle_batch_pool_size: 10