Avoid NPE in cfg command

    - Avoid NPE when a component has no configurable property or doesn't exist
    - Specificly use a numeric value for SharedExecutors.DEFAULT_POOL_SIZE so
      the value appears in cfg command
    - Also use print instead of system.err since it is being redirected
      away from the console

Change-Id: Ib73016b1a9282493f0c5c8c217dd33292eac4ba4

@@ -95,7 +95,9 @@ public class ComponentConfigCommand extends AbstractShellCommand {
     private void listComponentProperties(String component) {
         Set<ConfigProperty> props = service.getProperties(component);
         print("%s", component);
-        if (shortOnly) {
+        if (props == null) {
+            print("No properties for component " + component + " found");
+        } else if (shortOnly) {
             props.forEach(p -> print(SHORT_FMT, p.name(), p.value()));
         } else {
             props.forEach(p -> print(FMT, p.name(), p.type().toString().toLowerCase(),
@@ -108,7 +110,7 @@ public class ComponentConfigCommand extends AbstractShellCommand {
         Optional<ConfigProperty> property = props.stream()
                 .filter(p -> p.name().equals(name)).findFirst();
         if (!property.isPresent()) {
-            System.err.println("Property " + name + " for component " + component + " not found");
+            print("Property " + name + " for component " + component + " not found");
             return;
         }
         ConfigProperty p = property.get();

@@ -64,9 +64,9 @@ public class CoreManager implements CoreService {
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ComponentConfigService cfgService;
 
-    @Property(name = "sharedThreadPoolSize", intValue = SharedExecutors.DEFAULT_POOL_SIZE,
+    @Property(name = "sharedThreadPoolSize", intValue = 30,
             label = "Configure shared pool maximum size ")
-    private int sharedThreadPoolSize = SharedExecutors.DEFAULT_POOL_SIZE;
+    private int sharedThreadPoolSize = 30;
 
     @Activate
     public void activate() {